fix(desktop): adiciona permissao start-dragging e debug logging no Hub

- Adiciona core🪟allow-start-dragging para corrigir erro ACL do drag-region
- Adiciona logging detalhado no ChatHubWidget para debug de clicks
- Adiciona logging no comando open_chat_window para diagnostico
- Ajusta ordem size/position e set_ignore_cursor_events no Hub
- Remove set_hub_minimized apos build para evitar conflitos de timing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/desktop/src-tauri/capabilities/default.json

@@ -14,6 +14,7 @@
     "core:window:allow-hide",
     "core:window:allow-show",
     "core:window:allow-set-focus",
+    "core:window:allow-start-dragging",
     "dialog:allow-open",
     "opener:default",
     "store:default",