feat: implement mute conversation support for Mastodon

This feature allows users to visually hide muted conversations from the Home timeline. It includes:

- Automatic filtering of muted posts in Home.

- Immediate visual removal of posts when muting a conversation.

- New 'mute_conversation' action in context menu and keyboard shortcuts.

- Default shortcut: Alt+Win+Shift+Delete

- Win10/11 shortcut: Ctrl+Alt+Win+Backspace

src/wxUI/dialogs/mastodon/menus.py

@@ -14,6 +14,8 @@ class base(wx.Menu):
         self.Append(self.fav)
         self.unfav = wx.MenuItem(self, wx.ID_ANY, _(u"R&emove from favorites"))
         self.Append(self.unfav)
+        self.mute = wx.MenuItem(self, wx.ID_ANY, _(u"Mute/Unmute conversation"))
+        self.Append(self.mute)
         self.openUrl = wx.MenuItem(self, wx.ID_ANY, _("&Open URL"))
         self.Append(self.openUrl)
         self.openInBrowser = wx.MenuItem(self, wx.ID_ANY, _(u"&Open in instance"))