feat(hyprland): float+center Bluetooth + printer config dialogs

Conservative first cut of the floating-window audit (item 41): float and
center the two shipped, unambiguous config dialogs — blueman
(manager/adapters) and system-config-printer — alongside the mixer. Uses
(?i) class regexes tolerant of the XWayland `.…-wrapped` form, consistent
with the existing (?i) usage in this file.

Deliberately conservative: network is dmenu/nmtui (no GUI editor), and the
polkit prompt + GTK file portals are deferred because their window class
can't be verified headlessly — a guessed class is a dead rule. Those wait
for a hardware `hyprctl clients` read (queued).

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

agent/JOURNAL.md

@@ -17,6 +17,23 @@ Template:
 
 ---
 
+## 2026-07-07 — Floating-window audit, conservative cut (iteration #63, item 41)
+- **Task:** BACKLOG item 41 — Bernardo: "take a conservative approach."
+  Broaden the windowrule float set beyond the mixer.
+- **Method:** surveyed what GUI dialogs the distro actually ships (not a
+  blind list). Network is dmenu/nmtui (no GUI editor → no rule). Confident,
+  shipped, unambiguous dialogs: **blueman** (manager + adapters) and
+  **system-config-printer**. Deferred polkit (hyprpolkitagent exposes no
+  discoverable class) and GTK file portals — guessing a class = dead rule,
+  so those wait for a hardware `hyprctl clients` read.
+- **Fix:** `hyprland.nix` windowrule block — added float + center for the
+  two, `(?i)` regex tolerating the XWayland `.…-wrapped` form. RE2 `(?i)`
+  is already relied on in this file (line ~47), so it's consistent.
+- **Verified:** V0 green; `nix eval` confirms the rendered regex escaping
+  is correct (single backslash, `?` quantifier unescaped). Whether the
+  classes actually match live is V3 (queued — includes confirming the
+  regex catches the real class).
+
 ## 2026-07-07 — Right-click volume → floating mixer (iteration #62, item 35)
 - **Task:** BACKLOG item 35 — right-click the Waybar volume module to
   open a mixer in a floating window. (Bernardo re-launched /loop after I'd