Model card play as cards landing on a table

Cards appeared and disappeared. A card was drawn at its resting place
the frame it was played, and a finished trick slid off in a straight
line at a constant speed with every card starting and stopping
together. Nothing about that reads as a hand putting a card down.

What a real card does is arrive from the side of the person who threw
it, carry past the spot it was aimed at and rock back, and finish a
little crooked and a little off the mark. That is the whole model. There
are no collisions and no ragdolls, because the difference between cards
on a table and cards thrown down a stairwell is entirely the size of the
numbers: the tilt is capped at four and a half degrees and the drift at
five per cent of a card width, and both are smaller than they want to
be.

The flight is one underdamped spring on a single 0-to-1 value, with
position, angle and height above the table all read off it. The
overshoot is the spring passing 1 and returning, so the card carries and
settles as one motion rather than as three animations that happen to
start together. Driving them apart was tried and looked like it.

The scatter is hashed out of the card's identity rather than drawn from
a generator. A generator would give a card a new angle on every
recomposition, which twitches; hashing the list position instead would
make a card jump whenever another landed beside it. Hashed this way a
card lies the same way for as long as it lies there, and no two cards in
a deck lie the same way as each other. The pure half of that — the
hash, the bounds, the sweep stagger — is unit tested, since it is not
something a screenshot would show.

The sweep now staggers and accelerates: cards break away over the first
third of it rather than in lockstep, each carrying out the same turn it
carried in. Piles are drawn as the last few cards of the heap and stocks
as a pack with depth, so a card played onto a discard pile lands on
something. Every card gains the shadow of a card lying on felt.

Applied to Euchre, Kaiser, Wizard and Hearts at the trick, and to
Crazy 8s, President and Golf at the pile; hands get a tilt small enough
that nobody sees it and large enough that a row of cards stops looking
printed. Motion follows the existing animation-speed setting through a
composition local, so the slider still governs all of it.

Series bumped to 1.3 for the dev channel.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_0132V9gE6DF9itz2z3Hn7BK9

README.md

@@ -173,7 +173,7 @@ production package instead.
 - `.github/workflows/ci.yml` — builds, tests and lints on `dev` and on pull
   requests into `dev` or `main`. Its APK artifact is a dev build, versioned
   `<series>.0-dev` — the series being whatever `plgVersionSeries` says in
-  `gradle.properties`, currently **1.1**.
+  `gradle.properties`, currently **1.3**.
 - `.github/workflows/release.yml` — on push to `main`, builds the APK and
   publishes it as a GitHub Release tagged `v<series>.<run-number>`. The in-app updater
   reads that tag, which is why the APK's `versionCode` is the same run number.
@@ -201,7 +201,7 @@ A version is **`<series>.<run number>`**. The series is set by hand, once, in
 `gradle.properties`:
 
 ```properties
-plgVersionSeries=1.1
+plgVersionSeries=1.3
 ```
 
 Both workflows read that same property when they name a release tag, and the