docs: CLI Logos on Tabs in the settings reference and the dashboard page

The Settings Reference gets the new row in the Appearance tab table, the
Dashboard's Session tabs section says what the logo is and where to turn
it off, and the CliEntry.shortBadge comment in docs/cli-registry.md no
longer implies every tab always shows a logo.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/wiki/The-Dashboard.md

@@ -73,6 +73,10 @@ precedence there.
 
 One tab per session, in your order, and that order syncs across your devices.
 
+An agent tab shows its CLI's logo before the name, and a shell tab an `SH` badge. **CLI Logos
+on Tabs** (App Settings → Appearance → Tabs) hides the logos on that device; the tile and split
+headers and the Run menus keep theirs.
+
 **Status is carried by the dot and the tab's own styling:**
 
 | Look                          | Meaning                                                                 |