Message Logger: keep own deletions, remove from view, reset marks

- Delete dialog: "Keep message for myself" checkbox keeps your deletion on
  this device (marked deleted); unticked, the message is hidden and never
  restored. Already deleted messages get a plain "Remove from view" dialog
  (fixes the chat staying dimmed/touch-blocked after it).
- "Reset deleted/edited marks" in the chat menu (Plugins) and, for all
  chats, in the plugin settings.
- Fix restored text-only messages showing as empty bubbles (rich text
  wrappers like links lost their text); missing settings icons.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/views/comments.py

@@ -304,7 +304,7 @@ class Comments(History):
         if rich is not None:
             _strip_rich_header(rich)
             plain = _rich_plain_text(rich)
-            if plain is not None:  # text only: a normal bubble
+            if plain:  # text only: a normal bubble
                 msg.message = plain
                 msg.entities = ArrayList()
                 msg.rich_message = None