[A-EDev]

Summary

• Captions now use the app font, including a custom one, at the weight the caption Bold switch picks. With a variable font the Bold switch uses its real bold.
• The system font keeps the same caption typefaces as before.
• Covers the video player, the TV player and the caption style preview.

Related issue

Closes #1427

Change type

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

Validation

• ./gradlew :app:assembleGithubDebug
• ./gradlew :app:testGithubDebugUnitTest: passed (5931 tests with the branches of this batch merged on current main, 0 failed)
• I ran any additional flavor-specific build or test tasks affected by this change. spotlessCheck and :app:compileFossDebugKotlin passed
• I manually tested the affected behavior on an Android device or emulator. With Google Sans Flex as the app font, captions draw in it.

Test device and Android version: POCO X6 Pro 5G, Android 16 (HyperOS)

Screenshots or recordings

Risk and compatibility

No new setting. Widgets and notifications keep the system font, as the Font screen says.

• 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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