Add system-wide dictation for Pro users

[ComputelessComputer]

Support configurable shortcuts and focused text insertion on macOS, Windows, and Linux. Gate access on Pro and handle recorder ownership, cancellation, and transcript recovery.

ANLG-382.

---

Summary by cubic

Adds system-wide dictation for Pro users. Dictation previously worked only inside the chat composer; now a configurable global shortcut starts recording from any app on macOS, Windows, and Linux, shows a phase overlay, and inserts the transcript into the focused text field.

New Features

• Adds a dictation controller that manages press-and-hold and hands-free modes, including quick releases, cancellation, and transcript recovery.
• Enforces recorder ownership through a transcription session ID, so a new session cancels the active one.
• Preserves key releases and clipboard contents, validates editable targets, retains failed shortcut registrations, and cancels work racing native startup.
• Keeps the last dictation when shortcuts or recording availability change, and clears it on disable or account changes.
• Excludes the dictation overlay from persisted window state.
• Adds Spanish translations for the dictation settings and recovery messages.

Dependencies

• Adds @anlg/plugin-shortcut, the global-hotkey crate, and ashpd for cross-platform global shortcuts.

Implements ANLG-382.

^{Written for commit 018ca42. Summary will update on new commits.}

[cubic-dev-ai]

All reported issues were addressed across 273 files

Not reviewed (too large): apps/desktop/src/i18n/locales/af/messages.ts (~2 lines), apps/desktop/src/i18n/locales/am/messages.ts (~2 lines), apps/desktop/src/i18n/locales/ar/messages.ts (~2 lines), apps/desktop/src/i18n/locales/as/messages.ts (~2 lines), apps/desktop/src/i18n/locales/az/messages.ts (~2 lines), apps/desktop/src/i18n/locales/ba/messages.ts (~2 lines), apps/desktop/src/i18n/locales/be/messages.ts (~2 lines), apps/desktop/src/i18n/locales/bg/messages.ts (~2 lines), apps/desktop/src/i18n/locales/bn/messages.ts (~2 lines), apps/desktop/src/i18n/locales/bo/messages.ts (~2 lines), and 40 more - if these are generated or fixture files, add them to ignored paths to exclude them from future reviews.

<sub>Note: This PR contains a large number of files. cubic selects up to 200 of the highest-priority eligible files for this review, so some files may not have been reviewed.

Re-trigger cubic</sub>