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>

README.md

@@ -20,6 +20,11 @@ the device, so a chat opened again, even offline, shows them at once.
 - **Deleted messages stay.** Messages others delete remain in the chat at 75% opacity with a
   red trash icon (from the active icon pack) in the time row. Messages deleted while the app
   was closed are confirmed with Telegram and restored from the logger copy.
+- **Keep your own deletions.** The delete dialog gets a *Keep message for myself* checkbox: ticked,
+  the deletion goes to Telegram but the message stays on this device, marked deleted.
+  Unticked (the default), it is deleted as usual and never restored from the logger here.
+  Deleting a message that is already deleted shows a plain dialog that removes it from view
+  on this device only.
 - **Edit history.** *Edit history* in the message menu (right above Forward, for edited
   messages) opens every version as a mock chat, also for the logger groups' own posts, with
   an *Open topic* button for the history topic in the activity group.
@@ -29,6 +34,9 @@ the device, so a chat opened again, even offline, shows them at once.
 - **Links into chats you're not in.** Message links into a chat the current account isn't
   in (e.g. a log post's "Message" link) open that chat as a signed-in account that is in it;
   going back returns to your account.
+- **Reset marks.** *Reset deleted/edited marks* in the chat's menu (Plugins) forgets that
+  chat's cached marks and checks it with the server again; the same row in the plugin
+  settings does it for every chat. Messages you removed from view stay hidden.
 - **Cache lifetime.** Cached answers are kept for 1, 7, 30, 90 or 365 days, or forever
   (30 by default).