Allow Media3 decoder fallback for Dolby Vision input

[PixPMusic]

Compressor rejects some iPhone Dolby Vision videos before Media3 can attempt decoding. The source preflight requires a decoder advertising the exact video/dolby-vision MIME type, overlooking compatible HEVC base-layer decoding.

Let Media3 inspect Dolby Vision profiles and select a compatible decoder instead of blocking these inputs upfront. Preserve the original input metadata and retain the existing preflight for other source codecs. Unsupported Dolby Vision profiles can still fail through Media3's normal error handling.

Adds regression tests for Dolby Vision reaching output planning without an advertised decoder and unsupported HEVC retaining its decoder error. Enables Android resources in unit tests so the planner's localized errors can be checked.

Validation:

• bash gradlew assembleDebug testDebugUnitTest with JDK 21: passed, 38 tests.
• The equivalent Compressor Edge patch was tested on a Pixel 10 Pro Fold, Android 17 / SDK 37: the same 3840×2160 / 60 fps iPhone Dolby Vision clip failed before the change and compressed successfully afterward, confirmed by the device owner. The Compressor build has been verified locally but has not been separately installed on that phone.

Equivalent fix for Compressor Edge: JoshAtticus/CompressorEdge#5. These PRs target independent apps and have no merge-order dependency.

Model: GPT-6.1 Sol | Harness: Codex in T3 Code

[github-actions]

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w: file:///home/runner/work/Compressor/Compressor/app/src/main/java/compress/joshattic/us/ui/components/TargetSizeWarning.kt:135:31 'val Icons.Filled.ArrowForward: ImageVector' is deprecated. Use the AutoMirrored version at Icons.AutoMirrored.Filled.ArrowForward.
w: file:///home/runner/work/Compressor/Compressor/app/src/main/java/compress/joshattic/us/ui/screens/CompressionFailedScreen.kt:55:28 'val LocalClipboardManager: ProvidableCompositionLocal<ClipboardManager>' is deprecated. Use LocalClipboard instead which supports suspend functions.
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