Merge dev: update channels, clearer Euchre table, bolder Sequence highlight

Publishes a new production release so installs on v1.0.1 are offered an
OTA upgrade.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015qjfMiPUDshdKEUa6vxqzN

.github/workflows/ci.yml

@@ -2,8 +2,14 @@ name: CI
 
 # Pre-merge checks. Runs on the dev branch and on every pull request aimed at
 # dev or main, so breakage is caught before it reaches main and triggers a
-# release. Builds the same debug APK as the release pipeline, but publishes it
+# release.
-# only as a workflow artifact — no tag, no GitHub Release.
+#
+# On a push to dev it also publishes the build as a dev-channel prerelease, so
+# the in-app updater can offer it to anyone who has switched to that channel.
+# Prereleases are used deliberately: GitHub's "latest release" endpoint skips
+# them, so a production-channel user never sees a dev build. Pull requests only
+# build and check — they never publish, which keeps a PR from a fork from
+# shipping anything.
 on:
   push:
     branches: [ dev ]
@@ -11,8 +17,9 @@ on:
     branches: [ main, dev ]
   workflow_dispatch:
 
+# Needed to publish the dev-channel prerelease below.
 permissions:
-  contents: read
+  contents: write
 
 # A newer push to the same branch or PR makes the in-flight run obsolete.
 concurrency:
@@ -23,6 +30,11 @@ jobs:
   build:
     name: Build and check
     runs-on: ubuntu-latest
+    env:
+      # Stamp the APK as a dev-channel build only when this is a real push to
+      # dev. Pull request builds stay unstamped at 1.0.0-dev, since they are
+      # never published and must not claim a channel version.
+      PLG_CHANNEL: ${{ (github.event_name == 'push' && github.ref == 'refs/heads/dev') && 'dev' || '' }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -64,3 +76,35 @@ jobs:
             app/build/reports/
           if-no-files-found: ignore
           retention-days: 14
+
+      # Everything below publishes the dev channel, and only ever from a push
+      # to dev that has already built, tested and linted clean above.
+      - name: Stage dev APK
+        id: stage
+        if: github.event_name == 'push' && github.ref == 'refs/heads/dev'
+        run: |
+          set -euo pipefail
+          version="v1.0.${{ github.run_number }}-dev"
+          src="app/build/outputs/apk/debug/app-debug.apk"
+          dest="ProLibertateGames-${version}.apk"
+          cp "$src" "$dest"
+          echo "version=$version" >> "$GITHUB_OUTPUT"
+          echo "apk=$dest" >> "$GITHUB_OUTPUT"
+
+      - name: Publish dev channel prerelease
+        if: github.event_name == 'push' && github.ref == 'refs/heads/dev'
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          set -euo pipefail
+          gh release create "${{ steps.stage.outputs.version }}" \
+            "${{ steps.stage.outputs.apk }}" \
+            --repo "${{ github.repository }}" \
+            --target "${{ github.sha }}" \
+            --title "ProLibertateGames ${{ steps.stage.outputs.version }}" \
+            --prerelease \
+            --notes "Automated **dev channel** build from \`${{ github.sha }}\` on \`dev\`.
+
+          Preview build: newer than production, and less tested. Switch to the
+          Dev update channel in Settings to be offered these. Marked as a
+          prerelease so production-channel installs never see it."

.github/workflows/release.yml

@@ -25,10 +25,9 @@ jobs:
     if: github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
     env:
-      # Tells the build this is a real release, so the APK is stamped with the
+      # Stamps the APK as a production-channel build, versioned with the run
-      # run number that matches the tag below. Absent everywhere else, which
+      # number that matches the tag published below.
-      # keeps dev and local builds at 1.0.0-dev.
+      PLG_CHANNEL: production
-      PLG_RELEASE: "1"
     steps:
       - name: Checkout
         uses: actions/checkout@v4

README.md

@@ -48,9 +48,10 @@ them.
 - **Sound** on/off.
 - **Animation speed**, 0.5×–2×. One multiplier drives card movement and how long
   the computer appears to think.
-- **Updates** — check on launch, or check on demand. Updates are pulled from the
+- **Updates** — check on launch, or check on demand, from either of two
-  latest GitHub Release of this repository, which CI publishes on every push to
+  channels:
-  `main`.
+  - **Production** — stable builds, published from `main`.
+  - **Dev** — preview builds, published from `dev` on every green CI run.
 
 ## Screen sizes
 
@@ -78,13 +79,31 @@ Requires JDK 17 and the Android SDK (compileSdk 34).
   publishes it as a GitHub Release tagged `v1.0.<run-number>`. The in-app updater
   reads that tag, which is why the APK's `versionCode` is the same run number.
 
-**OTA updates follow `main`, and only `main`.** The updater asks GitHub for the
+### Update channels
-latest published Release; the release workflow is the only thing that creates
+
-one, and it refuses to run off any branch but `main` — so a manual dispatch
+Both pipelines publish, to two separate channels:
-aimed at `dev` does nothing rather than shipping unreviewed code to every
+
-install. Only that workflow sets `PLG_RELEASE`, which is what stamps a real
+| Channel | Published by | Tag | Marked |
-`versionCode`; dev builds stay at `1.0.0-dev` so a side-loaded CI artifact can
+| --- | --- | --- | --- |
-never outrank a genuine release and suppress future updates.
+| Production | `release.yml`, push to `main` | `v1.0.<n>` | release |
+| Dev | `ci.yml`, push to `dev` | `v1.0.<n>-dev` | prerelease |
+
+Dev builds are published as **prereleases** deliberately: GitHub's "latest
+release" endpoint skips prereleases, so a production-channel install can never
+be handed a dev build even by accident. Pull requests build and check but never
+publish, so a PR from a fork cannot ship anything.
+
+`release.yml` additionally refuses to run off any branch but `main`, so a manual
+dispatch aimed elsewhere does nothing rather than shipping unreviewed code.
+
+**The two channels have independent version sequences** — a build's `versionCode`
+is the run number of the workflow that produced it, and the two workflows count
+separately. Versions are therefore only ever compared *within* a channel; the app
+reads the `-dev` suffix in its own `versionName` to know which channel it is on,
+and treats a change of channel as an explicit switch rather than an upgrade.
+One consequence: switching channels can be a downgrade as far as Android is
+concerned, in which case the install is refused until the current copy is
+uninstalled. The settings screen says so when it applies.
 
 The debug keystore is committed on purpose: every build is signed with the same
 key, so an OTA update installs over the previous one instead of being rejected

app/build.gradle.kts

@@ -4,20 +4,17 @@ plugins {
     id("org.jetbrains.kotlin.plugin.serialization")
 }
 
-// Only the release workflow stamps a real version. It sets PLG_RELEASE, and its
+// Which update channel this build belongs to, set by whichever workflow built
-// GITHUB_RUN_NUMBER is the same number as the release tag it publishes
+// it: release.yml stamps "production" from main, ci.yml stamps "dev" from the
-// (v1.0.<run-number>), so the shipped APK knows its own version and the in-app
+// dev branch. Unset for a local build, which counts as dev.
-// updater can compare against the latest published release.
 //
-// Everything else — a local build, or the dev CI pipeline — stays at 1.0.0-dev.
+// GITHUB_RUN_NUMBER alone is not enough to key off, because it counts per
-// GITHUB_RUN_NUMBER alone is NOT enough to key off: it counts per workflow, so
+// workflow — the two pipelines have entirely independent sequences. That is
-// the dev pipeline has its own independent sequence. A debug APK installed from
+// also why versionCode is only ever compared *within* a channel; see
-// a CI artifact would otherwise carry that counter as its versionCode, could
+// UpdateChannel for how switching between them is handled.
-// outrank a genuine release, and would leave the updater reporting "you're on
+val buildChannel = System.getenv("PLG_CHANNEL").orEmpty()
-// the latest version" indefinitely.
+val runNumber = (System.getenv("GITHUB_RUN_NUMBER") ?: "").toIntOrNull() ?: 0
-val isReleaseBuild = System.getenv("PLG_RELEASE") == "1"
+val stampVersion = buildChannel.isNotEmpty() && runNumber > 0
-val releaseRunNumber = (System.getenv("GITHUB_RUN_NUMBER") ?: "").toIntOrNull() ?: 0
-val stampReleaseVersion = isReleaseBuild && releaseRunNumber > 0
 
 android {
     namespace = "org.prolibertate.games"
@@ -27,12 +24,14 @@ android {
         applicationId = "org.prolibertate.games"
         minSdk = 24
         targetSdk = 34
-        // Dev builds sit at 1, below every release except the very first —
+        // The -dev suffix in versionName is what the installed app reads to
-        // a v1.0.1 release ties with a dev build and so is not offered as an
+        // know its own channel, so it must survive into the shipped APK.
-        // update. Harmless, and preferable to versionCode 0, which Android
+        versionCode = if (stampVersion) runNumber else 1
-        // documents as out of range.
+        versionName = when {
-        versionCode = if (stampReleaseVersion) releaseRunNumber else 1
+            stampVersion && buildChannel == "production" -> "1.0.$runNumber"
-        versionName = if (stampReleaseVersion) "1.0.$releaseRunNumber" else "1.0.0-dev"
+            stampVersion -> "1.0.$runNumber-dev"
+            else -> "1.0.0-dev"
+        }
     }
 
     signingConfigs {

app/src/main/java/org/prolibertate/games/settings/SettingsRepository.kt

@@ -10,6 +10,7 @@ import androidx.datastore.preferences.core.stringPreferencesKey
 import androidx.datastore.preferences.preferencesDataStore
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
+import org.prolibertate.games.update.UpdateChannel
 
 private val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = "settings")
 
@@ -25,6 +26,8 @@ data class Settings(
     val animationSpeed: Float = 1.0f,
     val checkForUpdatesOnLaunch: Boolean = true,
     val playerName: String = "Player",
+    /** Which builds the updater offers. Production unless deliberately changed. */
+    val updateChannel: UpdateChannel = UpdateChannel.PRODUCTION,
 ) {
     /** Scales a nominal duration by the chosen speed. */
     fun scaled(millis: Long): Long =
@@ -43,6 +46,7 @@ class SettingsRepository(private val context: Context) {
         val SPEED = floatPreferencesKey("animation_speed")
         val UPDATE_ON_LAUNCH = booleanPreferencesKey("check_updates_on_launch")
         val NAME = stringPreferencesKey("player_name")
+        val CHANNEL = stringPreferencesKey("update_channel")
     }
 
     val settings: Flow<Settings> = context.dataStore.data.map { prefs ->
@@ -51,9 +55,16 @@ class SettingsRepository(private val context: Context) {
             animationSpeed = prefs[Keys.SPEED] ?: 1.0f,
             checkForUpdatesOnLaunch = prefs[Keys.UPDATE_ON_LAUNCH] ?: true,
             playerName = prefs[Keys.NAME] ?: "Player",
+            updateChannel = prefs[Keys.CHANNEL]
+                ?.let { stored -> runCatching { UpdateChannel.valueOf(stored) }.getOrNull() }
+                ?: UpdateChannel.PRODUCTION,
         )
     }
 
+    suspend fun setUpdateChannel(channel: UpdateChannel) {
+        context.dataStore.edit { it[Keys.CHANNEL] = channel.name }
+    }
+
     suspend fun setSoundEnabled(enabled: Boolean) {
         context.dataStore.edit { it[Keys.SOUND] = enabled }
     }

app/src/main/java/org/prolibertate/games/ui/SettingsScreen.kt

@@ -8,6 +8,7 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.Divider
+import androidx.compose.material3.FilterChip
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Slider
@@ -25,6 +26,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import kotlinx.coroutines.launch
 import org.prolibertate.games.settings.Settings
+import org.prolibertate.games.update.UpdateChannel
 import org.prolibertate.games.update.Updater
 
 @Composable
@@ -98,11 +100,44 @@ fun SettingsScreen(
 
             Text("Updates", fontWeight = FontWeight.Bold, style = MaterialTheme.typography.titleMedium)
             Text(
-                text = "Installed: v${env.updater.installedVersionName()}. Updates come from " +
+                text = "Installed: v${env.updater.installedVersionName()} " +
-                    "the latest release published on the project's main branch.",
+                    "(${env.updater.installedChannel().label} channel).",
                 style = MaterialTheme.typography.bodySmall,
             )
 
+            Column {
+                Text("Update channel", fontWeight = FontWeight.Bold)
+                Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                    UpdateChannel.entries.forEach { channel ->
+                        FilterChip(
+                            selected = settings.updateChannel == channel,
+                            onClick = {
+                                scope.launch {
+                                    env.settingsRepository.setUpdateChannel(channel)
+                                }
+                                updateStatus = null
+                                pendingRelease = null
+                            },
+                            label = { Text(channel.label) },
+                        )
+                    }
+                }
+                Text(
+                    text = settings.updateChannel.blurb + ".",
+                    style = MaterialTheme.typography.bodySmall,
+                )
+                if (settings.updateChannel != env.updater.installedChannel()) {
+                    // The channels are numbered independently, so a switch can
+                    // be a downgrade as far as Android is concerned.
+                    Text(
+                        text = "You're on a ${env.updater.installedChannel().label} build. " +
+                            "Switching channels installs a different build rather than a " +
+                            "newer one — if Android refuses it, uninstall this copy first.",
+                        style = MaterialTheme.typography.bodySmall,
+                    )
+                }
+            }
+
             SettingRow(
                 title = "Check on launch",
                 subtitle = "Look for a newer release when the app starts",
@@ -117,16 +152,22 @@ fun SettingsScreen(
 
             PrimaryAction(text = "Check for updates now") {
                 scope.launch {
-                    updateStatus = "Checking…"
+                    updateStatus = "Checking the ${settings.updateChannel.label} channel…"
-                    when (val result = env.updater.check()) {
+                    when (val result = env.updater.check(settings.updateChannel)) {
                         is Updater.Result.UpToDate -> {
-                            updateStatus = "You're on the latest version."
+                            updateStatus =
+                                "You're on the latest ${settings.updateChannel.label} build."
                             pendingRelease = null
                         }
 
                         is Updater.Result.Available -> {
                             pendingRelease = result.release
-                            updateStatus = "Version ${result.release.tag} is available."
+                            updateStatus = if (result.isChannelSwitch) {
+                                "${result.release.tag} is the current " +
+                                    "${result.release.channel.label} build."
+                            } else {
+                                "Version ${result.release.tag} is available."
+                            }
                         }
 
                         is Updater.Result.Failed -> {

app/src/main/java/org/prolibertate/games/ui/game/EuchreScreen.kt

@@ -22,6 +22,8 @@ import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.draw.rotate
+import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import org.prolibertate.games.game.euchre.CallTrump
 import org.prolibertate.games.game.euchre.Discard
@@ -35,7 +37,6 @@ import org.prolibertate.games.game.euchre.teamOf
 import org.prolibertate.games.net.MatchController
 import org.prolibertate.games.ui.PrimaryAction
 import org.prolibertate.games.ui.ScreenScaffold
-import org.prolibertate.games.ui.common.CardBackView
 import org.prolibertate.games.ui.common.PlayingCardView
 import org.prolibertate.games.ui.theme.FeltGreenDark
 
@@ -83,7 +84,7 @@ fun EuchreScreen(
                         .background(FeltGreenDark),
                     contentAlignment = Alignment.Center,
                 ) {
-                    TrickArea(current, cardWidth)
+                    TrickArea(current, localSeat, cardWidth)
                 }
 
                 notice?.let {
@@ -93,7 +94,7 @@ fun EuchreScreen(
                 when (current.phase) {
                     EuchrePhase.BID_ROUND_1,
                     EuchrePhase.BID_ROUND_2,
-                    -> BiddingControls(current, legal) { controller.submit(it) }
+                    -> BiddingControls(current, localSeat, legal) { controller.submit(it) }
 
                     EuchrePhase.HAND_OVER -> Text(
                         text = current.log.lastOrNull().orEmpty(),
@@ -146,40 +147,96 @@ private fun ScoreBar(state: EuchreState, localSeat: Int) {
     }
 }
 
-@Composable
+/**
-private fun TrickArea(state: EuchreState, cardWidth: androidx.compose.ui.unit.Dp) {
+ * Where a seat sits relative to you: 0 is you, then clockwise round the table.
-    Column(horizontalAlignment = Alignment.CenterHorizontally) {
+ * Euchre seats are numbered clockwise and partners sit opposite, so 2 is always
-        state.upCard?.let { up ->
+ * your partner.
-            Text("Turned up", color = MaterialTheme.colorScheme.onPrimary)
+ */
-            PlayingCardView(card = up, width = cardWidth)
+private fun relativePosition(seat: Int, localSeat: Int): Int = ((seat - localSeat) % 4 + 4) % 4
+
+private fun seatLabel(relative: Int): String = when (relative) {
+    0 -> "You"
+    1 -> "Left"
+    2 -> "Partner"
+    else -> "Right"
 }
-        if (state.trick.isNotEmpty()) {
+
-            Row(horizontalArrangement = Arrangement.spacedBy(6.dp)) {
+/**
-                state.trick.forEach { played ->
+ * The table. Each card sits on the side of the player who played it and is
-                    Column(horizontalAlignment = Alignment.CenterHorizontally) {
+ * turned to face them, so you can read a trick at a glance instead of matching
+ * seat numbers to cards.
+ */
+@Composable
+private fun TrickArea(state: EuchreState, localSeat: Int, cardWidth: Dp) {
+    Box(modifier = Modifier.fillMaxSize().padding(4.dp)) {
+
+        // The turn card sits in the middle of the table during bidding.
+        state.upCard?.let { up ->
+            Column(
+                modifier = Modifier.align(Alignment.Center),
+                horizontalAlignment = Alignment.CenterHorizontally,
+            ) {
                 Text(
-                            text = "Seat ${played.seat}",
+                    text = "Turned up",
                     style = MaterialTheme.typography.labelSmall,
                     color = MaterialTheme.colorScheme.onPrimary,
                 )
-                        PlayingCardView(card = played.card, width = cardWidth)
+                PlayingCardView(card = up, width = cardWidth)
             }
         }
-            }
-        } else if (state.upCard == null && state.phase == EuchrePhase.PLAYING) {
-            Text("Lead a card", color = MaterialTheme.colorScheme.onPrimary)
-        }
 
-        // Opponents' hands are only ever card counts on this device.
+        if (state.upCard == null && state.trick.isEmpty() && state.phase == EuchrePhase.PLAYING) {
-        Row(
+            Text(
-            modifier = Modifier.padding(top = 12.dp),
+                text = if (state.turn == localSeat) "Lead a card" else "Waiting…",
-            horizontalArrangement = Arrangement.spacedBy(4.dp),
+                color = MaterialTheme.colorScheme.onPrimary,
-        ) {
+                modifier = Modifier.align(Alignment.Center),
-            state.handCounts.forEachIndexed { seat, count ->
+            )
-                if (seat != state.turn) return@forEachIndexed
-                repeat(count.coerceAtMost(5)) {
-                    CardBackView(width = cardWidth * 0.4f)
         }
+
+        state.trick.forEach { played ->
+            val relative = relativePosition(played.seat, localSeat)
+            val alignment = when (relative) {
+                0 -> Alignment.BottomCenter
+                1 -> Alignment.CenterStart
+                2 -> Alignment.TopCenter
+                else -> Alignment.CenterEnd
+            }
+            // Rotate to face the player who played it: the side seats end up
+            // landscape, the partner's card upside down from your side.
+            val rotation = when (relative) {
+                1 -> 90f
+                2 -> 180f
+                3 -> -90f
+                else -> 0f
+            }
+
+            Column(
+                modifier = Modifier.align(alignment),
+                horizontalAlignment = Alignment.CenterHorizontally,
+            ) {
+                PlayingCardView(
+                    card = played.card,
+                    width = cardWidth,
+                    modifier = Modifier.rotate(rotation),
+                )
+                Text(
+                    text = seatLabel(relative),
+                    style = MaterialTheme.typography.labelSmall,
+                    color = MaterialTheme.colorScheme.onPrimary,
+                )
+            }
+        }
+
+        // Who is on the clock, shown where they sit rather than as a seat number.
+        if (state.phase == EuchrePhase.PLAYING && state.trick.size < state.activeSeatCount) {
+            val waitingOn = relativePosition(state.turn, localSeat)
+            if (waitingOn != 0 && state.trick.none { it.seat == state.turn }) {
+                Text(
+                    text = "${seatLabel(waitingOn)} to play",
+                    style = MaterialTheme.typography.labelSmall,
+                    color = MaterialTheme.colorScheme.onPrimary,
+                    modifier = Modifier.align(Alignment.BottomStart),
+                )
             }
         }
     }
@@ -188,22 +245,43 @@ private fun TrickArea(state: EuchreState, cardWidth: androidx.compose.ui.unit.Dp
 @Composable
 private fun BiddingControls(
     state: EuchreState,
+    localSeat: Int,
     legal: List<EuchreMove>,
     onMove: (EuchreMove) -> Unit,
 ) {
     if (legal.isEmpty()) {
-        Text("Waiting for seat ${state.turn}…")
+        val waitingOn = relativePosition(state.turn, localSeat)
+        Text("Waiting for ${seatLabel(waitingOn).lowercase()} to bid…")
         return
     }
+
+    // Controls only render on your turn, so the seat on the clock is you —
+    // which means being the dealer is what decides whether ordering up hands
+    // the turn card to somebody else or to yourself.
+    val youAreDealer = state.turn == state.dealer
+    val upCard = state.upCard
+
     Column(verticalArrangement = Arrangement.spacedBy(6.dp)) {
         Text(
-            text = if (state.phase == EuchrePhase.BID_ROUND_1) {
+            text = when {
-                "Order up ${state.upCard?.label.orEmpty()}?"
+                state.phase != EuchrePhase.BID_ROUND_1 -> "Name a suit for trump"
-            } else {
+                youAreDealer -> "Pick up ${upCard?.label.orEmpty()} for trump, or pass?"
-                "Name a suit"
+                else -> "Order up ${upCard?.label.orEmpty()} for trump, or pass?"
             },
             fontWeight = FontWeight.Bold,
         )
+        if (state.phase == EuchrePhase.BID_ROUND_1 && upCard != null) {
+            Text(
+                text = if (youAreDealer) {
+                    "Taking it makes ${upCard.suit.symbol} trump and puts that card " +
+                        "in your hand — you'll then discard one."
+                } else {
+                    "Ordering it up makes ${upCard.suit.symbol} trump and gives that " +
+                        "card to the dealer."
+                },
+                style = MaterialTheme.typography.bodySmall,
+            )
+        }
         Row(
             modifier = Modifier.horizontalScroll(rememberScrollState()),
             horizontalArrangement = Arrangement.spacedBy(6.dp),
@@ -211,11 +289,16 @@ private fun BiddingControls(
             legal.forEach { move ->
                 val label = when (move) {
                     is Pass -> "Pass"
-                    is OrderUp -> if (move.alone) "Order up alone" else "Order up"
+                    is OrderUp -> when {
-                    is CallTrump -> {
+                        youAreDealer && move.alone -> "Pick it up, alone"
-                        (if (move.alone) "Alone " else "") + move.suit.symbol
+                        youAreDealer -> "Pick it up"
+                        move.alone -> "Order up alone"
+                        else -> "Order up ${upCard?.suit?.symbol.orEmpty()}"
                     }
 
+                    is CallTrump ->
+                        if (move.alone) "${move.suit.symbol} alone" else "Make it ${move.suit.symbol}"
+
                     is Discard -> "Discard ${move.card.label}"
                     is PlayCard -> move.card.label
                 }
@@ -234,7 +317,7 @@ private fun HandRow(
     state: EuchreState,
     seat: Int,
     legal: List<EuchreMove>,
-    cardWidth: androidx.compose.ui.unit.Dp,
+    cardWidth: Dp,
     onPlay: (EuchreMove) -> Unit,
 ) {
     val hand = state.hands.getOrNull(seat).orEmpty()

app/src/main/java/org/prolibertate/games/ui/game/SequenceScreen.kt

@@ -47,6 +47,13 @@ import org.prolibertate.games.ui.ScreenScaffold
 import org.prolibertate.games.ui.theme.FeltGreenDark
 import org.prolibertate.games.ui.theme.TeamColours
 
+/**
+ * Outline for a square the selected card can be played on. Deliberately not a
+ * theme colour: it must contrast with both team chip colours and with the
+ * board in either light or dark mode.
+ */
+private val HighlightAmber = Color(0xFFFFC107)
+
 /**
  * The Sequence board.
  *
@@ -191,8 +198,16 @@ private fun BoardCell(
             .clip(RoundedCornerShape(size * 0.12f))
             .background(if (card == null) MaterialTheme.colorScheme.primary else Color.White)
             .border(
-                width = if (highlighted) 2.dp else 0.5.dp,
+                // Playable squares are outlined heavily rather than tinted: the
-                color = if (highlighted) MaterialTheme.colorScheme.tertiary else Color(0x33000000),
+                // outline has to read against a white card, a green corner and
+                // a chip sitting on top of it. Scaled off the cell so it stays
+                // visible on a small screen without swamping a large one.
+                width = if (highlighted) {
+                    (size * 0.10f).coerceIn(3.dp, 6.dp)
+                } else {
+                    0.5.dp
+                },
+                color = if (highlighted) HighlightAmber else Color(0x33000000),
                 shape = RoundedCornerShape(size * 0.12f),
             )
             .clickable { onClick() },

app/src/main/java/org/prolibertate/games/update/Updater.kt

@@ -8,11 +8,29 @@ import android.provider.Settings
 import androidx.core.content.FileProvider
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
+import org.json.JSONArray
 import org.json.JSONObject
 import java.io.File
 import java.net.HttpURLConnection
 import java.net.URL
 
+/**
+ * Which builds the updater offers.
+ *
+ * The two channels are published by different workflows and so have entirely
+ * separate version sequences — a dev build's versionCode is its CI run number,
+ * a production build's is its release run number, and the two are unrelated.
+ * Versions are therefore only ever compared *within* a channel; moving between
+ * them is treated as an explicit switch rather than an upgrade.
+ */
+enum class UpdateChannel(val label: String, val blurb: String) {
+    PRODUCTION("Production", "Stable builds released from main"),
+    DEV("Dev", "Preview builds from the dev branch — newer, less tested"),
+}
+
+/** Marks a version name as belonging to the dev channel. */
+private const val DEV_SUFFIX = "-dev"
+
 /**
  * Over-the-air updates from the repository's GitHub Releases.
  *
@@ -23,56 +41,135 @@ import java.net.URL
  */
 class Updater(private val activity: Activity) {
 
-    data class Release(val tag: String, val versionCode: Int, val apkUrl: String, val apkName: String)
+    data class Release(
+        val tag: String,
+        val versionCode: Int,
+        val apkUrl: String,
+        val apkName: String,
+        val channel: UpdateChannel,
+    )
 
     sealed interface Result {
-        data class Available(val release: Release) : Result
+        /**
+         * [isChannelSwitch] means this build is from a different channel than
+         * the one installed, so it is an explicit move rather than a newer
+         * version of the same line.
+         */
+        data class Available(val release: Release, val isChannelSwitch: Boolean) : Result
+
         data object UpToDate : Result
         data class Failed(val reason: String) : Result
     }
 
-    suspend fun check(): Result = withContext(Dispatchers.IO) {
+    suspend fun check(channel: UpdateChannel): Result = withContext(Dispatchers.IO) {
         try {
-            val latest = fetchLatestRelease()
+            val latest = fetchLatestRelease(channel)
-                ?: return@withContext Result.Failed("No published release found.")
+                ?: return@withContext Result.Failed(
-            if (latest.versionCode <= installedVersionCode()) {
+                    "No ${channel.label.lowercase()} build has been published yet."
-                Result.UpToDate
+                )
-            } else {
+
-                Result.Available(latest)
+            when {
+                // Different channel: version numbers are not comparable, so
+                // always offer it and let the user decide.
+                latest.channel != installedChannel() ->
+                    Result.Available(latest, isChannelSwitch = true)
+
+                latest.versionCode > installedVersionCode() ->
+                    Result.Available(latest, isChannelSwitch = false)
+
+                else -> Result.UpToDate
             }
         } catch (e: Exception) {
             Result.Failed(e.message ?: "Update check failed.")
         }
     }
 
-    private fun fetchLatestRelease(): Release? {
+    /**
-        val url = URL("https://api.github.com/repos/$OWNER/$REPO/releases/latest")
+     * Production reads GitHub's "latest release", which by definition skips
-        val connection = (url.openConnection() as HttpURLConnection).apply {
+     * prereleases. Dev walks the release list for the newest prerelease, which
+     * is what the CI pipeline publishes from the dev branch.
+     */
+    private fun fetchLatestRelease(channel: UpdateChannel): Release? = when (channel) {
+        UpdateChannel.PRODUCTION ->
+            getJsonObject("https://api.github.com/repos/$OWNER/$REPO/releases/latest")
+                ?.let { toRelease(it) }
+
+        UpdateChannel.DEV ->
+            getJsonArray("https://api.github.com/repos/$OWNER/$REPO/releases?per_page=30")
+                ?.let { releases ->
+                    // GitHub returns newest first.
+                    (0 until releases.length())
+                        .map { releases.getJSONObject(it) }
+                        .firstOrNull { it.optBoolean("prerelease") && !it.optBoolean("draft") }
+                        ?.let { toRelease(it) }
+                }
+    }
+
+    private fun toRelease(json: JSONObject): Release? {
+        val tag = json.optString("tag_name").ifBlank { return null }
+        // Tags are v1.0.<n> or v1.0.<n>-dev; the run number is the trailing part.
+        val versionCode = tag.substringAfterLast('.')
+            .removeSuffix(DEV_SUFFIX)
+            .toIntOrNull()
+            ?: return null
+        val channel =
+            if (tag.endsWith(DEV_SUFFIX) || json.optBoolean("prerelease")) {
+                UpdateChannel.DEV
+            } else {
+                UpdateChannel.PRODUCTION
+            }
+
+        val assets = json.optJSONArray("assets") ?: return null
+        for (i in 0 until assets.length()) {
+            val asset = assets.getJSONObject(i)
+            val name = asset.optString("name")
+            if (name.endsWith(".apk")) {
+                return Release(
+                    tag = tag,
+                    versionCode = versionCode,
+                    apkUrl = asset.getString("browser_download_url"),
+                    apkName = name,
+                    channel = channel,
+                )
+            }
+        }
+        return null
+    }
+
+    private fun openConnection(url: String): HttpURLConnection =
+        (URL(url).openConnection() as HttpURLConnection).apply {
             requestMethod = "GET"
             setRequestProperty("Accept", "application/vnd.github+json")
             setRequestProperty("User-Agent", "ProLibertateGames-Updater")
             connectTimeout = 15_000
             readTimeout = 15_000
         }
+
+    private fun getJsonObject(url: String): JSONObject? {
+        val connection = openConnection(url)
         try {
             if (connection.responseCode != 200) return null
-            val json = JSONObject(connection.inputStream.bufferedReader().use { it.readText() })
+            return JSONObject(connection.inputStream.bufferedReader().use { it.readText() })
-            val tag = json.getString("tag_name")
-            val versionCode = tag.substringAfterLast('.').toIntOrNull() ?: return null
-            val assets = json.getJSONArray("assets")
-            for (i in 0 until assets.length()) {
-                val asset = assets.getJSONObject(i)
-                val name = asset.getString("name")
-                if (name.endsWith(".apk")) {
-                    return Release(tag, versionCode, asset.getString("browser_download_url"), name)
-                }
-            }
-            return null
         } finally {
             connection.disconnect()
         }
     }
 
+    private fun getJsonArray(url: String): JSONArray? {
+        val connection = openConnection(url)
+        try {
+            if (connection.responseCode != 200) return null
+            return JSONArray(connection.inputStream.bufferedReader().use { it.readText() })
+        } finally {
+            connection.disconnect()
+        }
+    }
+
+    /** Read back from the installed APK's own version name. */
+    fun installedChannel(): UpdateChannel =
+        if (installedVersionName().endsWith(DEV_SUFFIX)) UpdateChannel.DEV
+        else UpdateChannel.PRODUCTION
+
     /** Downloads the APK and hands it to the system installer. */
     suspend fun downloadAndInstall(release: Release): String? = withContext(Dispatchers.IO) {
         try {