feat(bar): idle-inhibit (caffeine) toggle — generated bar + summer-day parity (item 13 slice)

Summer-night's whole-swap bar had an idle_inhibitor the generated bar
lacked (reverse parity gap from the 2026-07-04 sweep). The generated
bar now carries it — 󰾪 click → 󰅶, warm tint while active, tooltips
saying what it holds — blocking hypridle's lock/display-off/suspend
for videos and presentations; state deliberately resets with the bar.
summer-day mirrors summer-night's module + CSS, and the keybinds
cheatsheet mentions the bar click (via keybinds.extra).

V1: rendered config has the module with correct glyphs, CSS rules
present, cheatsheet row renders. Inhibit behaviour needs a session →
V3 queued.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

agent/JOURNAL.md

@@ -17,6 +17,23 @@ Template:
 
 ---
 
+## 2026-07-04 — caffeine/idle-inhibit toggle (iteration #23, item 13 slice)
+- **Task:** BACKLOG NEXT#13 first slice — idle_inhibitor in the
+  generated bar (summer-night had it; reverse parity gap).
+- **Did:** waybar.nix: idle_inhibitor module (󰾪/󰅶, tooltips, placed
+  after the ⏺), CSS membership + `.activated { color: @warn; }`.
+  summer-day: module + CSS mirrored from summer-night (same glyphs,
+  no tint — glyph change is the state signal there). keybinds.nix
+  extra row → cheatsheet mentions the bar click.
+- **Verified:** V0; V1 — template-home built; rendered config has the
+  module second in modules-right with correct glyphs; CSS rules
+  present; cheatsheet row renders. Inhibit behaviour needs a session
+  → V3 queued (hold past the lock timeout).
+- **Pending:** V3. Item 13 remaining slices: low-battery
+  notifications, color picker.
+- **Next suggestion:** item 13 next slice (low-battery notifications,
+  gate on power.laptop) — or #14 lock-bump CI if variety is better.
+
 ## 2026-07-04 — screen recording in Capture (iteration #22, item 12)
 - **Task:** BACKLOG NEXT#12 — record region/screen from the menu, stop
   from the bar.