Add playlist browser overlay modal (#37)

changes/260-playlist-browser.md

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+type: added
+area: overlay
+
+- Added a playlist browser overlay modal for browsing sibling video files and the live mpv queue during playback.
+- Added the default `Ctrl+Alt+P` keybinding to open the playlist browser and manage queue order without leaving playback.

changes/261-macos-overlay-passthrough.md

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+type: fixed
+area: overlay
+
+- Keep tracked macOS visible overlays click-through by default so subtitle sidebar passthrough works immediately without requiring a subtitle hover cycle first.
+- Add regression coverage for the macOS visible-overlay passthrough default.

changes/262-anilist-post-watch-dedupe.md

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+type: fixed
+area: anilist
+
+- Stop AniList post-watch from sending a second progress update when the current episode was already satisfied by a ready retry item in the same watch-completion pass.
+- Add regression coverage for the retry-queue plus live-update duplicate path.