feat(themes): #53 last previews + quarantine neon-glass broken bar

Capture executive-slate + neon-glass preview.png (480x270, theme-shot) —
all 24 themes now have picker previews. Quarantine neon-glass's broken
whole-swap: its waybar.css referenced @accent/@base/… with no
@define-color block, and waybar.nix reads a whole-swap css raw (no palette
prepend), so applying it rendered broken bar colours. Removing it falls
back to the generated bar from the theme's JSON palette.

Verified: V2 theme-shot renders viewed — executive-slate clean; neon-glass
bar now renders correctly, no config-error banner. V0 flake check green.

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

agent/BACKLOG.md

@@ -120,15 +120,6 @@ pass — accentAlt retuned to Latte mauve `#8839ef`, not the audit's pink
 of the btop-changed themes (rose-pine, everforest, summer-night, vantablack,
 catppuccin) — btop.theme isn't contrast-checked.
 
-### 53. Missing theme previews + neon-glass whole-swap (promoted 2026-07-09, V2)
-- Capture `executive-slate` + `neon-glass` `preview.png` headlessly via the
-  theme-shot recipe proven on boreal (480×270); optional hand `btop.theme`.
-- **First, for neon-glass:** its `waybar.css` uses `@text/@base/…` with no
-  `@define-color` block (and no `waybar.jsonc`), so applying it yields broken
-  bar colours. Decide: **finish** (self-contained colours + jsonc + preview)
-  or **quarantine** (remove `waybar.css` → falls back to the generated bar),
-  then capture the preview. V2 render.
-
 ### 54. Installer safety + polish — V2 scenarios pending
 Four guards shipped 2026-07-09 (V0/V1: bash -n, flake check, nomarchy-install
 builds): offline `compose-lock` failure now fail-closes instead of a network
@@ -206,7 +197,8 @@ neon-glass quarantine.
 ### Bugs / broken behavior (codebase exam 2026-07-09)
 
 _(Waybar doctor indicator, Control Center appearance no-ops, summer-day
-scroll → #51; neon-glass broken waybar → #53.)_
+scroll → #51; neon-glass broken waybar → **fixed** 2026-07-09 by quarantine
+(removed `waybar.css` → generated bar; render-confirmed).)_
 
 - **Battery charge-limit / powerprofile only match `BAT*` sysfs names**
   `power.nix` oneshot and menu/waybar globs use
@@ -240,8 +232,9 @@ nomarchy-menu usage string, secondary docs, always-on pieces → #47.)_
 
 ### Theme polish / completeness (codebase exam 2026-07-09)
 
-- **boreal preview recapture nicety** (executive-slate + neon-glass previews
-  → **#53**). `boreal` now has a `preview.png` (2026-07-09) but it's a headless
+- **theme preview recapture nicety** (all 24 themes now have `preview.png`
+  as of 2026-07-09 — executive-slate + neon-glass captured via theme-shot).
+  These headless captures are a clean bare desktop+bar, not the
   theme-shot capture — a clean bare desktop+bar, not the floating-terminal
   (fastfetch+btop) composition the other 21 use; a real-hardware recapture to
   match the grid would be nicer (VM is the documented fallback). Optional hand

agent/JOURNAL.md

@@ -17,6 +17,22 @@ Template:
 
 ---
 
+## 2026-07-09 — #53 theme previews + neon-glass quarantine
+- **Task:** NEXT #53 — capture the last two missing previews + resolve the
+  neon-glass broken whole-swap. Product call: **quarantine**.
+- **Did:** Confirmed the contract (working whole-swaps carry 12–23
+  `@define-color` blocks; `waybar.nix:448` reads the whole-swap css **raw**,
+  no palette prepend — so neon-glass's 0-`@define-color` css is genuinely
+  broken). `git rm themes/neon-glass/waybar.css` → falls back to the generated
+  bar from its (fine) JSON palette. Rendered executive-slate + neon-glass via
+  theme-shot; captured 480×270 `preview.png` for both — **all 24 themes now
+  have previews**.
+- **Verified:** **V2** — viewed both renders: executive-slate clean; neon-glass
+  bar now renders correctly (generated palette), no banner. V0 flake check green
+  with the css removed.
+- **Pending:** none. Optional: hand `btop.theme` for the 3 identity themes; a
+  hardware recapture to match the floating-terminal composition (nicety note).
+
 ## 2026-07-09 — #54 installer safety + polish (delegated, worktree)
 - **Task:** NEXT #54. Sonnet worktree agent (installer only).
 - **Did:** offline `compose-lock` failure fail-closes (reuses the