[Cemoche]

Closes #131

Summary

Since #105, the matcher names a punctuation key by the character it types. That is right for AZERTY, QWERTZ and Dvorak. On non-Latin layouts (Russian, Hebrew, Greek), though, keycaps carry US legends, and browsers and GTK match punctuation shortcuts by US position. This PR restores that on non-Latin layouts.

• Layout tracker (installLayoutTracker in src/lib/shortcuts.ts):
  • It is a window keydown listener in the capture phase, installed once, before every shortcut listener and the Settings recorder.
  • It learns the layout's script from the last plain letter press: KeyA–KeyZ, no Shift, Alt, AltGr or Meta. Ctrl presses count.
  • A letter outside \p{Script=Latin} switches to the non-Latin state. Turkish ı and ß stay Latin.
• Non-Latin state: the typed-punctuation and shifted-symbol steps are skipped, so punctuation goes by US position.
  • Russian Ctrl+/ is back on the "/" keycap.
  • Hebrew Ctrl+[ and Ctrl+] are no longer swapped.
  • Hebrew Ctrl+/ is no longer on the Q key.
• Latin state: the Keyboard: punctuation shortcuts and letter keys that type ASCII (AZERTY ',', Dvorak, Hebrew) #105 rule is unchanged. This departs from the issue's proposal to drop the step-5 letter-position fallback, and keeps it.
  • Without it, Hebrew Ctrl+W has no key in the Latin state, both at startup and after switching from a Latin layout to Hebrew before typing a letter.
  • The cost is cosmetic: Dvorak's "'" key and QWERTZ Ctrl+AltGr+Q also read as Ctrl+Q, which has no default.
• Limit: the webview cannot ask which layout is active. Right after a layout switch, the previous layout's rule applies until a letter is typed. Example: on Dvorak right after Russian, Ctrl+, and Ctrl+/ have no key until then. On macOS, Cmd presses don't update the tracker (not verified); plain typing does.
• Tests:
  • The every-key-of-every-layout sweeps (one match at most, Ctrl+Alt matches nothing, recorder round trip) run on all 7 layouts in both states.
  • "Every default has a key" runs in each layout's own state and in the Latin startup state with no letter typed.
  • Explicit tables cover Russian, Hebrew and Greek. Other tests cover which presses update the tracker, an end-to-end switch through useShortcut, and recorder cases.
  • src/test/setup.ts resets the tracker after each test.
• Docs: amendment Keyboard: keep US positions for punctuation shortcuts on non-Latin layouts (Russian, Hebrew) #131 in spec §5.3 (Keyboard: punctuation shortcuts and letter keys that type ASCII (AZERTY ',', Dvorak, Hebrew) #105's "provisional" note now points to it), the README paragraph under the shortcut table, and the manual check note.

AZERTY behaviour is unchanged. No Rust change.

How it was tested

$ pnpm exec vitest run --maxWorkers=1     # 1375 tests passed; after the review round: shortcuts + SettingsDialog, 85 passed
$ pnpm exec tsc --noEmit                  # clean

Manual check list (GNOME, with Russian, Hebrew and French AZERTY input sources; Super+Space to switch)

1. AZERTY, after typing any letter:
   • Ctrl+, (the "," key) opens Settings; Ctrl+; does nothing.
   • Ctrl+! and Ctrl+Shift+: comment in the editor.
   • Ctrl+& / Ctrl+é go to tabs 1 and 2; the "-" key gives tab 6.
   • Ctrl+W (the key labelled W) closes the tab.
2. Switch to Russian and type one letter in the editor (e.g. "ф"):
   • Ctrl + the "/" keycap comments.
   • Ctrl + the "[" / "]" keycaps go to the previous / next tab.
   • Ctrl + the "," keycap opens Settings.
   • Ctrl + the W keycap closes the tab.
3. Still on Russian, Settings → Keymap → record Ctrl + the "/" keycap: it reports the comment conflict.
4. Switch to Hebrew and type one letter: Ctrl + the "/" keycap comments, Ctrl + the Q keycap does not, and Ctrl+[ / Ctrl+] are not swapped.
5. Switch to Hebrew and, without typing a letter, press Ctrl + the W keycap: the tab closes (step-5 fallback, fix round 1).
6. Switch back to AZERTY and type one letter: step 1 behaviour is back. Before you type the letter, the "," key would still be read by position (Ctrl+M) — that is the stale limit.
7. Greek, after a letter: Ctrl + the "/" keycap comments, and Ctrl + the W keycap closes the tab.

Checklist

• pnpm test green
• pnpm lint green (tsc; no Rust change, clippy in CI)
• pnpm test:rust green (not applicable: no src-tauri/ change)
• No secret, token, real password or private key in the diff
• User-visible strings in src/lib/strings.ts
• Commits follow <emoji> <type>(<scope>): <description>

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