feat(keybinds): move window focus to SUPER+arrows

Swap the vim-style SUPER+H/J/K/L focus binds for SUPER+arrow keys
(movefocus l/r/u/d). SUPER+arrows were unbound and there are no vim
move-window binds, so no collision. prettyKeys renders the arrow keysyms
as glyphs so the SUPER+? cheatsheet shows "SUPER + <-" not "SUPER + left".

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

agent/JOURNAL.md

@@ -17,6 +17,18 @@ Template:
 
 ---
 
+## 2026-07-07 — Window focus: vim keys → arrows (iteration #61, direct request)
+- **Task:** Bernardo — switch window navigation from vim-style
+  SUPER+H/J/K/L to SUPER+arrow keys.
+- **Fix:** `modules/home/keybinds.nix` focus binds now use
+  `left/right/up/down` (movefocus l/r/u/d); H/J/K/L freed. No conflict —
+  SUPER+arrows were unbound and there were no vim *move-window* binds.
+  Also taught `prettyKeys` (rofi.nix) to render the arrow keysyms as
+  glyphs (← → ↑ ↓), so the SUPER+? cheatsheet reads "SUPER + ←" not
+  "SUPER + left" (Return etc. unaffected — no false substring match).
+- **Verified:** V0 green; `nix eval` confirms the binds render as
+  `$mod, left, movefocus, l` … and the glyph mapping is correct.
+
 ## 2026-07-07 — Audio mime → Amberol (iteration #60, item 37)
 - **Task:** BACKLOG item 37 — default video + audio players + mime. On
   inspection both players were already installed: mpv (video) and amberol