Answer "what can I press" in one keypress

The Shortcuts settings page answers "how do I change this", which is
worth opening a window for. This answers the other question, the one
you have with your hands already on the keyboard, so it is an overlay
on SUPER + / and the same key closes it.

It reads Keybinds.grouped() rather than a written-down list, so a
shortcut rebound in Settings shows its new chord here with nothing kept
in sync. A cheatsheet that lies is worse than none: it gets consulted
exactly when somebody does not already know.

Three columns, balanced by how many shortcuts each category holds. The
first attempt used a Flow, which wraps into as many columns as it likes
and made 120 binds across six uneven categories unreadable; it also
sized the card from a child that filled it, which is a circular binding
and produced a card taller than the display with its contents running
off the bottom. Both were found by looking at it rather than by a test,
which is the argument for looking at it.

Fixes a real bug on the way past: luaChord and formatChord appended the
key unconditionally, so the window switcher's modifier-only release
bind became "SUPER + " with a dangling separator. That matched neither
the chord keybinds.lua binds nor the one an override is keyed by, so
that bind could never be rebound and had no category -- it was sitting
in a seventh group of its own, which is how it was noticed.

config/dot/quickshell/services/Keybinds.qml

@@ -260,7 +260,14 @@ Singleton {
             if ((bind.modmask & modifier.bit) !== 0)
                 parts.push(modifier.name.toUpperCase());
         }
-        parts.push(String(bind.key ?? ""));
+        // A modifier-only bind has no key at all -- the window switcher commits
+        // on Super RELEASE. Appending an empty string left a dangling "SUPER + "
+        // that matched neither the chord hypr/keybinds.lua binds nor the one an
+        // override would be keyed by, so that bind could never be rebound and
+        // never found its category.
+        const key = String(bind.key ?? "");
+        if (key !== "")
+            parts.push(key);
         return parts.join(" + ");
     }
 
@@ -271,7 +278,8 @@ Singleton {
                 parts.push(modifier.name);
         }
         const key = String(bind.key ?? "");
-        parts.push(root.keyNames[key] ?? (key.length === 1 ? key.toUpperCase() : key));
+        if (key !== "")
+            parts.push(root.keyNames[key] ?? (key.length === 1 ? key.toUpperCase() : key));
         return parts.join(" + ");
     }