refactor: add targeted key appearance update mechanism

[ENOA-REIAH-UION]

Pull request

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Additional Info

[Copilot]

Pull request overview

Refactors keyboard redraw behavior by introducing a targeted “key appearance update” broadcast path, so only keys whose visuals depend on Rime state (e.g., composing/menu/paging) are invalidated instead of forcing full-keyboard redraws.

Changes:

• Introduces onKeyAppearanceUpdate(composing, menu) broadcast plumbing and emits it from InputView when tracked appearance state changes.
• Tracks and invalidates only state-dependent keys via Keyboard.appearanceStateKeys and per-key indices.
• Adds KeyboardView.invalidateKeyByIndex() to support targeted redraws.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
app/src/main/java/com/osfans/trime/ime/keyboard/KeyboardWindow.kt	Switches from composition-based full invalidation to targeted invalidation on key appearance updates.
app/src/main/java/com/osfans/trime/ime/keyboard/KeyboardView.kt	Adds per-index key invalidation helper.
app/src/main/java/com/osfans/trime/ime/keyboard/Keyboard.kt	Renames key list for stateful appearance and assigns stable key indices.
app/src/main/java/com/osfans/trime/ime/keyboard/Key.kt	Adds index field and marks keys with state-dependent behaviors for targeted updates.
app/src/main/java/com/osfans/trime/ime/core/InputView.kt	Tracks appearance-related state and broadcasts key appearance updates on change.
app/src/main/java/com/osfans/trime/ime/broadcast/InputBroadcaster.kt	Forwards the new key appearance update callback to receivers.
app/src/main/java/com/osfans/trime/ime/broadcast/InputBroadcastReceiver.kt	Adds the new onKeyAppearanceUpdate callback to the receiver interface.

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