Add wallpaper, power, date, accessibility, and real search

Continues the settings expansion toward replacing GNOME Settings for
everything Panama actually owns.

Wallpaper. A thumbnail grid rather than a path field: the value of this
setting is the picture, so typing a path to something you cannot see is
the worst version of it. Two things about hyprpaper 0.8 shaped this. Its
IPC is much smaller than older documentation suggests -- preload,
listloaded, unload, and reload all answer "invalid hyprpaper request",
so setting is a single call with no preload. And the "<empty>,<path>"
form that used to mean every output is silently ignored, so a wallpaper
set that way appears to succeed and never changes; outputs are walked
explicitly instead. hyprpaper.conf lives in the repo through the
~/.config/hypr symlink and so cannot hold machine state, which is why
the choice lives in the shared settings store and is re-applied at
startup.

Power & Lock. hypridle has no IPC for reconfiguration and its config is
hyprlang rather than the shared JSON, so scripts/panama-idle generates a
config from the settings store and restarts the daemon. The generated
file lives under XDG_STATE_HOME for the same symlink reason, with a
systemd drop-in pointing hypridle at it. Management is a real state and
the page says which one you are in rather than showing sliders that
quietly do nothing. Zero means never for all three timers, which a naive
template would render as "immediately".

Date & Time. Deliberately not stored in Panama's settings: the timezone
and network time belong to the machine and are shared with sessions that
never see this file. Storing a copy would create a second answer to a
question the system already answers. Reads and writes timedatectl
directly; a cancelled polkit prompt surfaces as an error rather than as
a value that appears to have been accepted.

Accessibility. Pointer size and text scale have to agree across three
consumers with no shared configuration -- the compositor, GTK, and the
shell -- so the store is the source of truth and the values are pushed
outward to gsettings and hyprctl setcursor.

Search now indexes the schema instead of the twelve page labels. "gaps",
"wallpaper", and "screenshot" previously found nothing on an app that
has all three, which is the clearest way a settings app feels smaller
than it is. Shortcuts are indexed by what they do. A contract asserts
every non-internal schema label is reachable, so a new setting cannot be
added in an undiscoverable state.

The GNOME delegation allow-list was widened to the panel names
gnome-control-center actually reports; the previous list contained
"users", which is not one of them and so opened nothing.

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

config/dot/quickshell/services/Accessibility.qml

@@ -0,0 +1,111 @@
+pragma Singleton
+
+// Pointer size and text scale.
+//
+// These are the two settings that must agree across three consumers that do not
+// share a configuration system: the compositor draws the cursor, GTK
+// applications read gsettings, and the shell renders its own text. Panama's
+// store is the source of truth, and this pushes the value out to the other two
+// so they cannot disagree.
+//
+//   pointer size  -> gsettings (GTK) + `hyprctl setcursor` (compositor)
+//   text scale    -> gsettings (GTK)
+//
+// The shell's own font size is not scaled here. Theme.qml's sizes are part of
+// the design rather than a user preference, and scaling them at runtime would
+// reflow every panel against layouts that were tuned at the design size. Text
+// scale therefore affects applications, which is where it matters, and the
+// page says so rather than implying it does more.
+
+import Quickshell
+import Quickshell.Io
+import QtQuick
+import qs.config
+
+Singleton {
+    id: root
+
+    property string cursorTheme: ""
+    property string lastError: ""
+
+    readonly property bool busy: themeQuery.running || runner.running || root.pending.length > 0
+
+    readonly property int cursorSize: DesktopPreferences.get("cursorSize")
+    readonly property real textScale: DesktopPreferences.get("textScale")
+
+    Process {
+        id: themeQuery
+        command: ["gsettings", "get", "org.gnome.desktop.interface", "cursor-theme"]
+        stdout: StdioCollector {
+            onStreamFinished: {
+                // gsettings quotes strings: 'oreo_blue_cursors'
+                root.cursorTheme = this.text.trim().replace(/^'|'$/g, "");
+            }
+        }
+    }
+
+    // A short queue, because applying one setting takes several commands and
+    // Process runs one at a time.
+    property var pending: []
+
+    Process {
+        id: runner
+        onExited: (exitCode, exitStatus) => {
+            if (exitCode !== 0)
+                root.lastError = "That accessibility setting could not be applied.";
+            root.drain();
+        }
+    }
+
+    function drain(): void {
+        if (runner.running || root.pending.length === 0)
+            return;
+        const next = root.pending[0];
+        root.pending = root.pending.slice(1);
+        runner.exec(next);
+    }
+
+    function enqueue(commands: var): void {
+        root.pending = root.pending.concat(commands);
+        root.drain();
+    }
+
+    Component.onCompleted: {
+        themeQuery.running = true;
+        settle.restart();
+    }
+
+    // Push the stored values outward once at startup, so a value changed in a
+    // previous session is in effect in this one even though gsettings and the
+    // compositor do not read Panama's store.
+    Timer {
+        id: settle
+        interval: 1200
+        onTriggered: root.applyAll()
+    }
+
+    Connections {
+        target: DesktopPreferences
+        function onRevisionChanged(): void { coalesce.restart(); }
+    }
+
+    Timer {
+        id: coalesce
+        interval: 250
+        onTriggered: root.applyAll()
+    }
+
+    function applyAll(): void {
+        root.lastError = "";
+        const size = String(root.cursorSize);
+        const commands = [
+            ["gsettings", "set", "org.gnome.desktop.interface", "cursor-size", size],
+            ["gsettings", "set", "org.gnome.desktop.interface", "text-scaling-factor", String(root.textScale)]
+        ];
+        // setcursor needs a theme name; skip it rather than guess if gsettings
+        // has not answered yet. The next change will catch up.
+        if (root.cursorTheme !== "")
+            commands.push(["hyprctl", "setcursor", root.cursorTheme, size]);
+        root.enqueue(commands);
+    }
+}