feat: usage meter, voice commands help, keychain fixes, landing waitlist #4768 — ccantynz/voxlen

Originally written by @ccantynz-alt on GitHub.
Imported from https://github.com/ccantynz-alt/voxlen/pull/33

Summary

Usage meter in Account tab: fetches api.voxlen.com/v1/usage, shows plan badge + progress bars for STT minutes and grammar corrections, upgrade CTA for Free plan
Voice commands expanded: added "clear", "new paragraph", "stop listening", "go back" — plus a VoiceCommandsHelp cheatsheet panel in the UI
Keychain fix: stale entries now deleted when API key is cleared (previously disconnect left ghost credentials in OS keychain)
Landing waitlist: per-platform waitlist cards replace broken download links; email stored to both unified and per-platform localStorage keys

Connect Voxlen API key in Account tab → usage meter appears below Connected card
Disconnect API key → usage meter disappears, keychain entry cleared
Open Voice Commands help panel → full cheatsheet visible
Say "clear" / "new paragraph" during dictation → commands execute
Visit landing page with no release → all 4 desktop platforms show waitlist form, not broken links
npm test — 95 tests pass
npx tsc --noEmit — no errors

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