[bluzername]

What

For #97 (the "custom silence removal" part).

The gap length that count as removable silence was a hardcoded MIN_SILENCE_DURATION = 0.3 in lib/silences.ts. findSilenceRanges() already take a minDuration parameter, it was just never reached from the UI, so there was no way for a user to ask for e.g. "cut anything over 0.1s" the way the issue want.

• lib/silenceThreshold.ts (new): a pure clampSilenceThreshold() (range 0.1s–2s, the floor the issue ask for) plus a thin localStorage load/save wrapper, same split as lib/theme.ts so the clamping is unit-testable without mocking window.
• hooks/useSilenceThreshold.ts (new): wires it to React state, same shape as useAppearance / useTelemetryPref.
• components/TranscriptToolsMenu.tsx: read the user's threshold instead of the constant for both findSilenceRanges() and the tool's tooltip text.
• components/SettingsMenu.tsx: a small range input for it, under the language picker, with the current value shown live ("1.2s").

Why

This is a real ask in the issue, and the underlying function already support it, so wiring a setting through is a small, low-risk change — no new cutting logic, just exposing what is already parameterized.

Tests

tests/silence-threshold-test.ts is new: it check clampSilenceThreshold() keeps in-range values, clamps below/at/above the floor and ceiling, and falls back to the default (not the floor) for NaN / non-finite input. Before lib/silenceThreshold.ts existed this failed with "Cannot find module"; after, it passes.

tests/silences-test.ts gets one more case proving a custom threshold reaches findSilenceRanges() end to end: the same 1.0s gap is included at the default 0.3s threshold and excluded once the threshold is raised to 1.5s.

npx tsx tests/silence-threshold-test.ts   # ALL SILENCE THRESHOLD TESTS PASSED
npx tsx tests/silences-test.ts            # ALL SILENCE TESTS PASSED (incl. new case)
npm run test:i18n                          # ALL I18N TESTS PASSED (new keys in all 9 locales)
npx next typegen && npx tsc --noEmit       # clean
npm run typecheck:electron                 # clean
npm run lint                                # clean
npm run build                                # compiles, prerenders

Also manually exercised in the running dev app (screenshots on request): the slider updates the Tools menu's live count/tooltip immediately, clamps at 2.0s, and the value survive a page reload.

Not run: test:ffmpeg / test:timeline are unaffected by this change but I ran test:timeline anyway as a smoke check and it also pass.

Checklist

• One topic (threshold setting only; the Italian-language half of Feature request: Italian language and custom silence removal #97 is PR feat(i18n): add Italian interface language #113)
• Conventional commit subject
• New/changed i18n keys translated in all locales this repo already ship, completeness test still pass

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