Build the settings vocabulary and generate the keymap

Stage 3 and 4 of docs/superpowers/plans/2026-08-17-panama-cohesion.md.

Add SettingsPage plus ToggleRow, SliderRow, ChoiceRow, ActionRow, and
TextRow. A row names a schema key and needs nothing else: label, detail,
range, and unit come from PreferenceSchema, and writes go through
SystemSettings.commitPreference, which routes compositor-backed keys
through apply-and-verify and local keys straight to the store. The page
scaffold that was copy-pasted eleven times is now one component.

Rebuild Appearance around a live preview of the real desktop, scaled by
the ratio between the preview and the actual monitor so a 10px gap on a
4500px display looks as small as it is. Rebuild Desktop & Dock and Input
& Shortcuts on the shared rows, replacing the read-only text that stood
in for controls that were merely expensive to add.

Generate the shortcut list from hyprctl binds. The page held a
hand-typed nineteen entries against a real keymap of a hundred and
thirteen; it could not show the rest and went stale whenever a bind
changed. Every bind now carries its own description -- backfilled for
the twenty-nine that lacked one -- and keybinds-contract.sh fails if any
bind lacks one, since undescribed binds are dropped from the page.

Make Restore defaults span every store Panama owns. Resetting only the
schema store left the Home accessory arrangement customised while
claiming to restore defaults, which is worse than no reset because it is
silent. Done through HomePreferences' existing public aliases rather
than a new API.

Four defects found while building:

cursor:inactive_timeout is answered by getoption as float, not int. A
wrong readAs does not fail loudly; it makes every write to that key look
rejected, and the user saw an error for a change that worked.
schema-hypr-shape-contract.sh now checks all 23 mapped options against
the running compositor.

The Settings window is tiled, so implicitWidth is only a hint and rows
must survive roughly 400px. SliderRow stacks its control under the label
below 520px.

Binding an anchor to undefined to switch layouts does not reliably
release it. Both row layouts are positioned explicitly.

Concurrent compositor writes are queued and merged rather than refused.
The startup replay of every compositor-backed preference routinely
overlaps a UI change, and refusing left the store and the compositor
disagreeing.

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

config/dot/quickshell/modules/settings/qmldir

@@ -20,3 +20,10 @@ SettingsToggle 1.0 SettingsToggle.qml
 SettingsWindow 1.0 SettingsWindow.qml
 ShortcutsPage 1.0 ShortcutsPage.qml
 SoundPage 1.0 SoundPage.qml
+SettingsPage 1.0 SettingsPage.qml
+ToggleRow 1.0 ToggleRow.qml
+SliderRow 1.0 SliderRow.qml
+ChoiceRow 1.0 ChoiceRow.qml
+ActionRow 1.0 ActionRow.qml
+TextRow 1.0 TextRow.qml
+DesktopPreview 1.0 DesktopPreview.qml