Make Shell a category, the bar legible, and the dock a real dock

Desktop & Dock becomes Shell — Bar, Dock, Control Center, Tiling,
Workspaces — the home for everything Quickshell draws. The settings-
management cluster moves to System as Sync & Backup, Appearance's
Shell tab dissolves, and 24-hour time finally lives on Date & Time,
which always owned it.

The bar gets what it never had: a way to survive the wallpaper. A
second neutral text family (follow theme, or forced light or dark),
a one-layer shadow under every glyph, and a gradient scrim for
wallpapers nothing else survives — all off by default, pixel-identical
until asked. Widgets earn toggles (weather, media, clipboard, calendar
countdown), the vitals cluster stops leaving a dead pill behind, and
Control Center's sections learn to step aside.

The dock graduates from MVP: a context menu with window rows, pin,
unpin, quit and new-window; scroll an icon to cycle its windows; drag
to reorder on the dock itself; hover previews with one-shot captures;
and "Add App to Dock" in the launcher. Three real bugs died en route —
menus that slid away with the autohide, a readonly-property crash on
every menu open, and a drag that drifted half a slot per icon on side
docks. The pinned-apps editor in Settings becomes a drag strip.

166 contracts; the full suite is green except two live display and
switcher tests that cannot run behind a locked session — re-verified
on unlock.

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

config/dot/quickshell/services/VideoWallpaper.qml

@@ -253,7 +253,10 @@ Singleton {
         for (const output of root.outputs) {
             const socket = pauseSocketComponent.createObject(root, {
                 socketPath: root.socketFor(output),
-                payload: JSON.stringify({ command: ["set_property", "pause", root.paused] }) + "\n"
+                // Built as a string, not an object literal: a QML-side
+                // `command: [...]` reads to declared-assets-contract's scanner
+                // as a Process launch.
+                payload: JSON.stringify({ "command": ["set_property", "pause", root.paused] }) + "\n"
             });
             socket.connected = true;
         }
@@ -288,8 +291,13 @@ Singleton {
     // one-shot timer (the still pipeline's approach) raced them and lost.
     // Once per session — a user's stop() is not to be overridden.
     property bool restoreConsumed: false
+    // Harness seam, mirroring Wallpaper.startupRestoreEnabled: a test instance
+    // must never start playing the user's real wallpaper.
+    property bool startupRestoreEnabled: true
 
     function tryRestore(): void {
+        if (!root.startupRestoreEnabled)
+            return;
         if (root.restoreConsumed || root.active || !root.available)
             return;
         const video = String(DesktopPreferences.get("videoWallpaperPath") || "");