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/modules/dock/Dock.qml

@@ -94,7 +94,16 @@ PanelWindow {
         return !!ws && ws.toplevels.values.length > 0;
     }
 
-    readonly property bool wantRevealed: !Settings.dockAutohide || !workspaceOccupied || pointer.hovered
+    // Anything anchored to the dock that the dock would drag off-screen with
+    // it. The pointer leaves the dock the moment it enters an open menu -- the
+    // menu is its own surface -- so without this the dock slides away under
+    // the menu it opened, and the row the hand was reaching for goes with it.
+    // The same is true mid-drag, and while a preview is up.
+    readonly property bool interactionHeld: dockContextMenu.visible
+        || body.dragging
+        || dockPreviews.visible
+
+    readonly property bool wantRevealed: !Settings.dockAutohide || !workspaceOccupied || pointer.hovered || root.interactionHeld
 
     property bool revealed: true
 
@@ -210,9 +219,13 @@ PanelWindow {
         DockBody {
             id: body
 
-            onContextMenuRequested: (anchorItem, entry) => {
+            onContextMenuRequested: (anchorItem, app) => {
+                // The whole app object, not its desktop entry: the menu lists
+                // the app's own windows and offers to pin or unpin it, and
+                // neither fact survives being narrowed to an entry.
+                body.dismissPreview();
                 dockContextMenu.anchorItem = anchorItem;
-                dockContextMenu.entry = entry;
+                dockContextMenu.app = app;
                 dockContextMenu.visible = true;
             }
 
@@ -270,4 +283,23 @@ PanelWindow {
     DockContextMenu {
         id: dockContextMenu
     }
+
+    // Its own surface rather than something drawn inside the dock: the dock's
+    // input mask is a thin strip when hidden and the bar's own rectangle when
+    // shown, and widening it to cover a preview would hand the dock every
+    // click in the empty space above it.
+    DockPreviews {
+        id: dockPreviews
+
+        anchorItem: body.previewAnchor
+        app: body.previewApp
+        position: root.position
+
+        // The pointer crossing from the icon to the previews leaves the dock
+        // entirely -- these are separate surfaces -- so the previews report
+        // their own hover back, and DockBody's grace timer uses it to tell
+        // "reaching for a preview" from "moved away".
+        onHoveredChanged: body.previewHovered = dockPreviews.hovered
+        onDismissed: body.dismissPreview()
+    }
 }