feat(desktop): performance and clipboard pages, a scrolling tile grid

The tile grid sits in a Flickable capped at three rows, so the fourth row
the new modules bring scrolls inside that box instead of eating the
notification space; a thin accent bar in the margin shows only when a row
is hidden. Tiles are reordered with the everyday ones first.

Performance shows the island's PerfPanel in a Page, with a tile line of CPU
and RAM and the warning dot. Perf.detailed is now a count of live PerfPanel
instances instead of a binding in the status pill: the island and the drawer
both host the panel, and a bool with two writers would let one clear it
under the other.

Clipboard reads cliphist when its page opens: search, copy on click or
Enter, delete per row, clear all behind a 3 second confirm, image entries as
thumbnails decoded once onto tmpfs. Entries reach sh as $1, never inside a
command string. A copy closes the drawer through a new Page.dismiss signal
the drawer connects like back.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/desktop/Page.qml b/desktop/Page.qml
index 4ef50c1..cb717e8 100644
--- a/desktop/Page.qml
+++ b/desktop/Page.qml
@@ -20,6 +20,9 @@ Item {
     property string icon: ""
     default property alias content: holder.data
     signal back
+    // Closes the whole drawer, for a page whose action is finished once done
+    // (the clipboard copies and gets out of the way).
+    signal dismiss
 
     Item {
         id: header