[A-EDev]

Summary

• The music bar's velocity tracker was fed the pointer position in the bar's own coordinates, but the bar moves down with the finger, so a flick measured close to zero speed and only a 32 dp pull closed it. With the navigation bar scrolled away, the bar sits 8 dp above the gesture area and there is little room for that pull.
• The tracker now uses Compose's addPointerInputChange, which accumulates position deltas for a moving node, the same as the queue sheet and FlowBottomSheet.
• The close fling threshold is now 300 dp/s instead of 800 px/s, so it feels the same on every screen density.
• The bar's position is unchanged.

Related issue

Closes #2064

Change type

• Bug fix
• Feature
• Refactor or maintenance
• Build, packaging, or CI
• Documentation

Validation

• ./gradlew :app:assembleGithubDebug (passes)
• ./gradlew :app:testGithubDebugUnitTest (6013 tests, 0 failed, run on all seven branches merged together)
• I ran any additional flavor-specific build or test tasks affected by this change. :app:compileFossDebugKotlin and spotlessCheck pass.
• I manually tested the affected behavior on an Android device or emulator.

Test device and Android version: Resizable emulator, API 37, phone layout. With the nav bar hidden, an 80 px flick in 20 ms closes the bar with this change; the same flick left the bar in place 3 out of 3 times on main.

Screenshots or recordings

Risk and compatibility

Gesture plumbing only. Upward drags also get the real speed now; they already decide on distance first (over 5 dp).

• The change does not introduce secrets, private data, or unexpected telemetry.
• New user-facing text uses Android string resources.
• Dependency and lockfile changes are intentional and limited to this PR.
• Room schema changes include the required version bump and migration, or this PR does not change the Room schema.
• Breaking changes and upgrade steps are clearly documented.

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