Let shortcuts be rebound from Settings

Every bind in keybinds.lua now goes through a small wrapper that
substitutes the chord from a stored override. Only the chord is taken
from settings; the action is always the Lua value written in that file,
so an override can move a shortcut but can never make one do something
else. That is the property that makes reading them from a file the user
can edit safe, and it is why the alternative -- storing dispatchers --
was not considered.

Overrides are keyed by the shipped chord rather than the description.
Keying by description moved every bind that shared one: rebinding
SUPER+C also moved the XF86Calculator hardware key onto the same chord,
silently costing it. Chords are unique; descriptions are not.

Applying needs hyprctl reload rather than a live hl.bind. Hyprland
reports Lua-defined binds with dispatcher "__lua" and a bytecode offset,
so the action cannot be reconstructed from outside to re-bind it; reload
re-runs the config, which re-reads the settings file.

The capture control ignores modifier-only presses, because every chord
passes through them and holding Super would otherwise be captured the
moment the modifier went down. It refuses a bare letter, which would
swallow ordinary typing, and refuses a key with no keysym name rather
than storing something that would fail to bind. Rebinding onto a chord
already in use is refused rather than shadowing the existing shortcut.

The refactor was verified by snapshotting all 113 binds before and
after: the keymap is byte-identical, and identical again after applying
an override and resetting it.

Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L

config/dot/quickshell/modules/settings/ShortcutsPage.qml

@@ -17,6 +17,11 @@ import qs.services
 SettingsPage {
     id: root
 
+    // The chord of the bind currently being re-recorded, in the Lua form; empty
+    // when nothing is being captured. Held here rather than per row so that
+    // starting a new capture cancels any other.
+    property string capturingChord: ""
+
     title: "Input & Shortcuts"
     lede: "The Forge mental model, carried forward into native tiling."
 
@@ -72,19 +77,92 @@ SettingsPage {
 
                 model: groupCard.modelData.binds
 
-                TextRow {
+                SettingRow {
+                    id: bindRow
+
                     required property var modelData
                     required property int index
 
-                    label: modelData.description
-                    value: modelData.chord
-                    controlWidth: 230
-                    divider: index < bindRows.count - 1
+                    readonly property bool capturing: root.capturingChord === bindRow.modelData.luaChord
+                    readonly property bool overridden: Keybinds.isOverridden(bindRow.modelData.luaChord)
+
+                    label: bindRow.modelData.description
+                    detail: bindRow.overridden
+                        ? "Moved from " + Keybinds.shippedChordFor(bindRow.modelData.luaChord)
+                        : ""
+                    controlWidth: 300
+                    divider: bindRow.index < bindRows.count - 1
+
+                    Item {
+                        anchors.right: parent.right
+                        anchors.verticalCenter: parent.verticalCenter
+                        width: 300
+                        height: 30
+
+                        ShortcutCapture {
+                            anchors.right: parent.right
+                            width: 230
+                            height: 30
+                            visible: bindRow.capturing
+                            focus: bindRow.capturing
+                            onCaptured: chord => {
+                                Keybinds.rebind(bindRow.modelData.luaChord, chord);
+                                root.capturingChord = "";
+                            }
+                            onCancelled: root.capturingChord = ""
+                        }
+
+                        Row {
+                            anchors.right: parent.right
+                            anchors.verticalCenter: parent.verticalCenter
+                            visible: !bindRow.capturing
+                            spacing: 8
+
+                            Text {
+                                anchors.verticalCenter: parent.verticalCenter
+                                text: bindRow.modelData.chord
+                                color: bindRow.overridden ? Theme.accent : Theme.fgDim
+                                font.family: Theme.fontFamily
+                                font.pixelSize: Theme.fontSize
+                            }
+
+                            SettingsButton {
+                                anchors.verticalCenter: parent.verticalCenter
+                                text: "Change"
+                                enabled: !Keybinds.reloading && !bindRow.modelData.mouse
+                                onClicked: root.capturingChord = bindRow.modelData.luaChord
+                            }
+
+                            SettingsButton {
+                                anchors.verticalCenter: parent.verticalCenter
+                                visible: bindRow.overridden
+                                text: "Reset"
+                                enabled: !Keybinds.reloading
+                                onClicked: Keybinds.resetBind(bindRow.modelData.luaChord)
+                            }
+                        }
+                    }
                 }
             }
         }
     }
 
+    SettingsCard {
+        visible: Object.keys(Keybinds.overrides).length > 0
+        title: "Changed shortcuts"
+        subtitle: "Rebinding stores only the new chord; what a shortcut does always comes from Panama's configuration."
+
+        ActionRow {
+            label: "Restore every shipped shortcut"
+            detail: Object.keys(Keybinds.overrides).length
+                + (Object.keys(Keybinds.overrides).length === 1 ? " shortcut moved" : " shortcuts moved")
+            action: "Restore all"
+            divider: false
+            enabled: !Keybinds.reloading
+            onTriggered: Keybinds.resetAll()
+        }
+    }
+
     SettingsCard {
         visible: Keybinds.lastError !== ""
         title: "Shortcuts unavailable"