NotificationDaemon, messageTray: Add inline reply support for notifications

[Twilight0]

This commit adds native support for inline reply text input boxes inside Cinnamon desktop notifications (org.freedesktop.Notifications).

Key Enhancements:

1. Notification Daemon Capabilities & Hints (js/ui/notificationDaemon.js):

   • Exposes 'inline-reply' and 'x-canonical-private-inline-reply' in GetCapabilities().
   • Parses inline reply hints ('x-canonical-private-inline-reply' and 'inline-reply') from incoming D-Bus Notify calls.
   • Registers and emits the NotificationReplied(uint32 id, string text) D-Bus signal when a user submits a reply.
   • Renders explicit 'Reply' action buttons on the banner, expanding the text input field on demand when clicked, while preserving all other action buttons (e.g. 'Like', 'Mark as Read').

2. UI & Focus Management (js/ui/messageTray.js):

   • Renders an St.Entry input field and Send St.Button in NotificationBanner when an inline reply hint is present or when the Reply action button is clicked.
   • Acquires a modal keyboard grab via Main.pushModal() on entry focus/interaction so typing events are routed to Cinnamon's stage rather than underlying application windows.
   • Releases the modal keyboard grab (Main.popModal()) on reply submission or notification destruction.
   • Connects both Return key press (clutter_text activate) and Send button clicks to emit the reply text and dismiss the notification popup.

[github-actions]

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Found 1 potential issue(s):

⚠️ WARNING

⚠️ lang_bind

js/ui/notificationDaemon.js:481

notification.connect('reply', Lang.bind(this,

Lang.bind() is deprecated. Use arrow functions (() => {}) or Function.prototype.bind() instead.

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Automated pattern check.