feat(settings): expose the software-encoder preference in the UI

[EtienneLescot]

Scoping PR — no implementation yet. The branch carries a single empty commit so the PR can exist; drop it when the real work starts.

The problem

The preference already exists end to end, but nothing lets a user set it.

• Declared and defaulted: src/lib/userPreferences.ts:26 and :39
• Read on capture start: src/hooks/useScreenRecorder.ts:843
• Threaded to the native helper: src/lib/nativeWindowsRecording.ts:5
• Honoured by the helper, which falls back to the software MFT encoder
• Covered by tests: src/lib/userPreferences.test.ts:108-119

But no .tsx file references preferSoftwareEncoder anywhere. The only way to turn it on today is to hand-edit localStorage.

Scope

• A toggle in the settings surface, wired to the existing preference. No new plumbing — the preference, its persistence and its consumer are all in place.
• Recording only. This flag does not touch the export encoder.

Semantics worth getting right in the copy

This is an override, not a selector: "use the software encoder even when a hardware one is available". It exists for hosts where the hardware encoder produces corrupt output or fails, which is a real class of driver bug.

That is a different thing from the automatic, hardware-derived encoder choice in the export-encoder PR — the UI wording should not lead a user to think this is how the app normally decides. Expect it to live under an advanced or troubleshooting section rather than in the main recording settings.

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