fix(window): inhibit compositor idle during video playback

[TheRealShek]

Problem:
GTK reports a successful idle-inhibit request on Omarchy, but Hyprland still reports inhibitingIdle=false while video plays. Natural end and seeking also need a consistent playback state before the inhibitor is released.

Solution:
Use the Wayland idle-inhibit protocol for the video window when available, with GTK's session inhibit as a fallback. Keep protocol discovery off the GTK blocking path and release inhibition on pause, natural end, navigation, failure and close. Pause the GStreamer pipeline at end of stream, preserve an accepted post-end seek for Play, and add a live Hyprland check. Declare the Wayland build/runtime dependencies and update the relevant documentation.

Tests:

• Passed: cargo fmt --check, cargo clippy --locked --all-targets -- -D warnings, cargo test --locked (195 passed, 16 ignored), and cargo build --release --locked.
• Passed on Omarchy/Hyprland: play, pause, resume, natural end, post-end seek, looping, and forced avdec_h264 software playback.
• Passed: targeted GTK video-sink recovery test with a generated fixture; ShellCheck, shell syntax, desktop entry and AppStream validation.
• Passed: Arch package build from the changed checkout; package build and tests passed (195 tests), and the final source snapshot built with its binary and desktop metadata present.
• Fedora RPM spec validation was unavailable on Arch. Of 29 packaging tests, 28 passed; the Fedora release-order test requires Python's rpm module.

Note:
Fedora GNOME/Wayland remains the reference environment and needs its CI and real-session checks before a support claim. The checked-in Arch recipe still fetches published v0.1.4, so the fix enters that package only when a new release updates its tag and checksum. Hyprland's inhibitingIdle flag was checked; a real Omarchy lock/blank timeout and the remaining manual and performance checks are still needed for full compatibility.

[coderabbitai]

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