fix(keybinds): SUPER+? bind uses base keysym slash, not question

Item 32. Item 26 added SHIFT to the modmask but kept the shifted keysym
`question`, so the bind stayed dead. Hyprland 0.55 resolves a bind's
keysym with SHIFT consumed (issue #7750, behaviour since 0.43): with
Shift held, `$mod SHIFT, question` is matched against `slash` and never
fires. The base keysym is what works — same pattern as this file's own
`$mod SHIFT, 1` workspace binds. Also updates rofi.nix prettyKeys to
collapse "SHIFT + /" → "?" so the cheatsheet row still reads "SUPER + ?".

Verified: V0 `nix flake check --no-build` green; V1 HM activation built,
built hyprland.conf carries `bind=$mod SHIFT, slash, exec, nomarchy-menu
keybinds` (kb_layout=us → slash is `?`). The keypress opening the menu is
V3 — queued (HARDWARE-QUEUE, existing SUPER+? entry updated).

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

agent/HARDWARE-QUEUE.md

@@ -35,10 +35,14 @@ QA machine), the **T14s** (webcam case).
       comma layout + rebuild + relogin. The SUPER+? no-op found en
       route IS a real bug → BACKLOG item 26 (fix shipped — see the
       dedicated SUPER+? entry below).
-- [ ] **SUPER+? opens the cheatsheet** (item 26 fix) — after
-      `home-update` + relogin (or `hyprctl reload`), SUPER+? must open
-      the keybindings cheatsheet, whose row still reads `SUPER + ?`
-      (not `SUPER + SHIFT + ?`).
+- [ ] **SUPER+? opens the cheatsheet** (item 32 re-fix — supersedes the
+      item 26 attempt) — the bind is now `$mod SHIFT, slash` (the BASE
+      keysym: Hyprland 0.55 resolves the sym with Shift consumed, so the
+      old `question` keysym never matched while Shift was down — same
+      pattern as the working `$mod SHIFT, 1` workspace binds). After
+      `home-update` + relogin (or `hyprctl reload`), SUPER+? must open the
+      keybindings cheatsheet, whose row still reads `SUPER + ?` (not
+      `SUPER + SHIFT + ?`).
 - [ ] **swaync readable on summer-day** (item 25 fix) — on summer-day
       after `home-update`: `notify-send "title" "body text"` shows
       readable body text; open the control centre (SUPER+N), hover a