fix(waybar): drop the bar to the bottom layer so fullscreen covers it

On Hyprland the `top` layer renders above every window, including a real
fullscreen surface — so a browser video gone fullscreen sat *under* the
bar (BACKLOG item 30). Move the bar to `layer: bottom` in the generated
waybar.nix and all four whole-swap jsoncs (parity rule); the exclusive
zone still reserves its space in normal tiling, but a fullscreen window
now covers it. Rationale comment kept in waybar.nix; data jsoncs left
comment-free (they carry none).

Verified: V0 (nix flake check --no-build, green) + V1
(homeConfigurations.nomarchy.activationPackage builds; built
.config/waybar/config shows "layer": "bottom"). V3 queued in
HARDWARE-QUEUE (fullscreen covers bar + returns on exit; floating-overlap
trade-off).

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

agent/JOURNAL.md

@@ -17,6 +17,25 @@ Template:
 
 ---
 
+## 2026-07-07 — Waybar overlaps fullscreen video (iteration #54)
+- **Task:** BACKLOG item 30 — bar drawn on top of a fullscreen YouTube video.
+- **Did:** `layer: top` → `bottom` in the generated `waybar.nix` and the
+  four whole-swap jsoncs (boreal, summer-night, summer-day,
+  executive-slate — parity rule). On Hyprland the top layer renders above
+  even real-fullscreen surfaces; bottom lets the fullscreen window cover
+  the bar while the exclusive zone still reserves its space in normal
+  tiling. Rationale comment in waybar.nix; data jsoncs left comment-free
+  (they carry none). Also shipped this session (pre-loop, user-driven):
+  battery discharging-icon gap widened (f848e73).
+- **Verified:** V0 (`nix flake check --no-build`, green) + V1
+  (`homeConfigurations.nomarchy.activationPackage` builds; the built
+  `.config/waybar/config` shows `"layer": "bottom"`).
+- **Pending:** V3 queued in HARDWARE-QUEUE — fullscreen video covers the
+  bar, bar returns on exit, floating-overlap trade-off. Can't be
+  eyeballed headlessly here.
+- **Next suggestion:** item 29 is `[human]`/`[blocked:hw]`; remaining
+  work is item 28 (theme UI) slices or a QA sweep.
+
 ## 2026-07-06 — menu parity for downstream-flake options (iteration #51, slice 1)
 - **Task:** PROPOSED item — ensure `nomarchy.*` options have a menu toggle where appropriate.
 - **Did:** Audited options and implemented the first slice of missing toggles in the TUI Control Center (`Updates`, `Battery Limit`, `Bluetooth`, `Printing`). Wired `modules/home/options.nix` and `modules/nixos/options.nix` to use `config.nomarchy.settings.*` as defaults.