[Sync] Pi chat mode + plan-mode rework, fastfetch icons, Claude statusline, fl KDE shortcuts

Re-export of the private tree at b5580f8 (2026-11-11).

- pi: new chat-mode extension, plan-mode rework, README and settings
  updates, version bump
- fastfetch: Packages/Display/WM/GPU/Memory key icons moved off the legacy
  Nerd Fonts v2 Material range (blank on v3 fonts) to Font Awesome glyphs
- claude: statusline runs git with --no-optional-locks, model default,
  pr-loop skill note, gh sync fix
- fl: kglobalshortcutsrc update

common/.pi/agent/settings.json

@@ -64,7 +64,7 @@
       "ex": "mode"
     }
   },
-  "lastChangelogVersion": "1.5.0",
+  "lastChangelogVersion": "1.5.2",
   "packages": [
     "npm:pi-vim"
   ]