fix(themes): dim the summer rasi search placeholder + latte/backdrop findings (item 28c)

Both summer whole-swap rasi rendered prompt and placeholder in the
same bg0 on the green inputbar, reading as one run-on phrase — the
placeholder is now bg0 at 60% alpha, matching the generated theme's
hierarchy.

Recorded with it: the catppuccin-latte 1080p capture shows the
generated menu fully coherent on light themes (the audit's "dark
terminal on latte" was a stale preview), and a dedicated VM probe
confirms misc:background_color is applied (hyprctl getoption =
0xFFEFF1F5) — the dark backdrop in captures is awww's empty-state
layer over it, a wallpaper-less-VM artifact, not a defect.

Verified: rasi edits grep-verified (visual rides the next summer
capture / hardware); latte capture + probe reviewed. Item 28 is now
gated on the icon-weight [human] call and the queued hardware
eyeballs.

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

agent/BACKLOG.md

@@ -89,10 +89,16 @@ review:
     summer-day capture).
   - summer-day whole-swap capture reviewed (iteration #35): the
     authored slate menu + island-pill bar survive the 28b retunes and
-    read as one coherent identity — keep. One nit: its rasi doesn't
-    dim the entry placeholder, so "Menu Type to search…" reads as one
-    run-on phrase (generated theme dims it; mirror that in the two
-    summer rasi).
+    read as one coherent identity — keep. ✓ placeholder-dim nit fixed
+    (iteration #38: both summer rasi, bg0 at 60% alpha).
+  - latte capture reviewed (iteration #38): the generated menu is
+    fully coherent on light themes (zebra rows, retuned surface, blue
+    selected, dimmed hints) — the audit's "dark terminal on latte"
+    preview concern was a stale preview, not a defect. Backdrop
+    probe: misc:background_color IS applied (hyprctl getoption =
+    0xFFEFF1F5); captures show dark because awww's empty-state layer
+    paints over it in the wallpaper-less VM — on hardware the fix
+    covers its intended window (the pre-awww startup gap).
   - Harness gap: wallpaper needs `~/.nomarchy` seeded in the guest
     (theme-sync reads runtime state there) — add before vibe-review
     captures; latte + an identity theme (lumon/retro-82) captures