feat(modal): migrate to @opentui-ui/dialog

- Add @opentui-ui/dialog package for dialog management
- Refactor Modal.ts with showLogoutConfirm() and showUpdateModal()
- Implement DialogManager singleton in router.ts
- Remove manual modal keyboard handling from keyboardHandler.ts
- Add OSC 8 hyperlinks for clickable URLs
- Update index.ts to use new modal API

Author: muhammedaksam

bun.lock

@@ -1,6 +1,6 @@
 {
   "name": "@muhammedaksam/waha-tui",
-  "version": "1.5.0-dev.9",
+  "version": "1.5.0-dev.10",
   "description": "TUI client for WhatsApp using WAHA (WhatsApp HTTP API) - manage chats, send messages, and more from your terminal",
   "module": "src/index.ts",
   "type": "module",
@@ -72,6 +72,7 @@
   },
   "dependencies": {
     "@muhammedaksam/waha-node": "^2026.1.1",
+    "@opentui-ui/dialog": "^0.0.4",
     "@opentui-ui/toast": "^0.0.5",
     "@opentui/core": "^0.1.72",
     "node-notifier": "^10.0.1",