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>

modules/home/keybinds.nix

@@ -33,11 +33,13 @@
     { mods = "$mod";        key = "X";      action = "exec, nomarchy-menu power";     desc = "Power menu"; }
 
     { mods = "$mod";        key = "N";      action = "exec, swaync-client -t";        desc = "Notification centre"; }
-    # SUPER+? — ? is typed as Shift+/, so SHIFT must be in the bind's
-    # modmask or Hyprland's exact-modifier match never fires (the key then
-    # falls through to the focused window; caught on hardware, item 26).
+    # SUPER+? — ? is Shift+/. SHIFT stays in the modmask (you hold it), but
+    # the keysym must be the BASE key `slash`, not `question`: Hyprland
+    # resolves the sym with Shift consumed, so `question` never matches while
+    # Shift is down — same as the `$mod SHIFT, 1` workspace binds. (item 26
+    # fixed the modmask but kept the shifted keysym → still dead; item 32.)
     # The cheatsheet still renders this row as SUPER + ? (rofi.nix).
-    { mods = "$mod SHIFT";  key = "question"; action = "exec, nomarchy-menu keybinds"; desc = "Keybindings cheatsheet"; }
+    { mods = "$mod SHIFT";  key = "slash";  action = "exec, nomarchy-menu keybinds"; desc = "Keybindings cheatsheet"; }
 
     # Menu functions — SUPER+CTRL+<mnemonic> jumps straight to a
     # nomarchy-menu module (all also reachable from the SUPER+M picker).