v1.3.1 - First-launch experience

What's fixed

This release fixes the single biggest first-run problem: the app looked dead on first launch.

Previously, double-clicking WritHer.exe showed nothing while the speech model
(~250 MB) downloaded in the background — no window, no progress, and hotkeys
didn't work yet. Many first launches ended with the user assuming the app was broken.

New first-launch experience

• 🚀 Visible loading status the widget appears within seconds showing
  "Downloading speech model…" with animated loading eyes while the model loads
• ✓ Ready confirmation when loading completes, the widget shows
  "Ready hold ‹your hotkey›" (it reflects your configured hotkeys)
• 👋 One-time welcome toast first launch ends with a Windows notification
  explaining both hotkeys
• ⚠️ Clear error path if the model download fails (e.g. no internet on
  first launch), you now get an error state on the widget and a toast telling
  you what to do, instead of silence
• 🔁 Second-instance toast launching WritHer twice now tells you it's
  already running in the tray, instead of exiting silently

All messages are localized (English, Italian, German).

Full Changelog: v1.3.0...v1.3.1