Harden browser recording controls and performance

[zortos293]

Adds browser-stream recording controls without pulling in the fork’s native GStreamer recording suite. This PR stacks on #724 and bounds local capture work so recording does not starve live decode/render.

• Adds 720p/1080p/1440p and 30/60 FPS capture settings with safe 720p30 defaults and a 12 Mbps custom bitrate ceiling.
• Captures only presented video frames into an aspect-preserving bounded canvas, then cancels callbacks, timers, tracks, and audio resources on every stop/error/unmount path.
• Serializes MediaRecorder chunk writes before finalization so stop cannot race pending file writes.
• Adds keyboard-accessible controls and explicit Starting, Recording, Finalizing, and error states in the normal Stream settings and Quick Menu Media page.
• Keeps screenshots, auth, packaging, updater behavior, and generated translations unchanged.

Ported from work by Akamiya Chizui in Chizuui/OpenNOW-Modified.

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