[Two-Play]

Fullscreen: plain black fade on both platforms, quicker

• Entering and leaving fullscreen (tilting, button, back, holding upright) now fades the whole app to black, turns the screen underneath and fades back in, on iOS and Android. On iOS the moving video (What's new, fullscreen by tilting, calmer shorts, marker editing #52) still turned in view; the plain fade read best on both. The morph stays in the code behind FullscreenMorph.curtainOnlyOverride (and its tests).
• Quicker for wide videos: settle time 350 → 250 ms, fade out 180 → 120 ms, fade in 300 → 200 ms, and two drawn frames + 50 ms after the turn instead of a fixed 200 ms. Still waits for the window to actually turn (at most 1 s).
• Android phones cut without the system's rotation animation (ROTATION_ANIMATION_JUMPCUT); the stretched old frame it shows for a moment is under the black. iOS already turns without animation.

Testing

• dart analyze, flutter test (883 tests, including the fade mode), flutter build apk --debug.
• Not tried on a device yet; iOS not built locally.

🤖 Generated with Claude Code

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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