feat(ui): sticker tile hover and playing feedback

[thewrz]

Summary

• Add canvas-local hover animation state for sticker tiles with 150 ms cubic ease-out interpolation.
• Amplify sticker/tile rotation from the existing idle +/-3 degree range to +/-8 degrees at full hover.
• Draw hover ink rings, playing Tone-derived accent rings, and playing glow/drop-shadow effects around the sticker disc.
• Split sticker animation/effect helpers into src/ui/sound_tile/ submodules to keep files under the repo's 400-line cap.

Closes #92

Design decisions

• Kept animation state inside the canvas::Program instead of adding app-level hover state or new Message variants. Canvas can retarget hover progress from cursor events and request redraws directly, which keeps the change scoped to tile rendering.
• Used cubic ease-out over 150 ms for hover entry/exit to match the acceptance timing while keeping idle progress at 0.0, so idle tile rendering follows the same paint path as PR1.
• Used Tone highlight for the playing sticker ring and glow so the playing feedback derives from the tile palette without changing Tone definitions.
• Added sound_tile/animation.rs and sound_tile/effects.rs only to respect HonkHonk's 400-line file limit; no new dependencies were added.

Verification

• cargo test after rebasing onto origin/main: 547 lib tests, 5 main tests, 19 decoder tests, 0 pipewire integration tests, 0 stream watcher integration tests, doc-tests all passed.
• cargo clippy --all-targets --all-features -- -D warnings passed.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5fc0758a-8bd9-45fb-9a1a-2cd732a5278c

📥 Commits

Reviewing files that changed from the base of the PR and between ea285f6 and 77be6e2.

📒 Files selected for processing (3)

• src/ui/sound_tile.rs
• src/ui/sound_tile/animation.rs
• src/ui/sound_tile/effects.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/issue-92-hover-animations

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[thewrz]

Claude normal adversarial review was used as the backup review path while CodeRabbit was unavailable/rate-limited.

Actionable findings addressed:

• Referenced the canvas Action type through the canvas module.
• Gated the retarget helper as test-only.
• Added redraw-loop/settling unit coverage.
• Replaced brittle exact float assertions with tolerance checks.

Verification:

• Local: cargo fmt, cargo test, cargo clippy --all-targets --all-features -- -D warnings.
• GitHub: release build, lint/fmt, unit tests, deny, LOC check all passing.

No remaining blocking findings from Claude. Residual note: I did not perform a live GUI hover/CPU-idle manual check in this environment. Formal approval could not be submitted from this account because GitHub rejects self-approval.