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, 7 insertions, 0 deletions

diff --git a/desktop/island/perf/PerfPanel.qml b/desktop/island/perf/PerfPanel.qml
index 5aad9b6..f149d82 100644
--- a/desktop/island/perf/PerfPanel.qml
+++ b/desktop/island/perf/PerfPanel.qml
@@ -37,6 +37,13 @@ GridLayout {
     function sensor(label) {
         return Perf.temps.find(t => t.label === label) || { value: null, warn: 0, crit: 0 };
     }
+    // Detailed sampling (per-core, network, VRAM, fan) runs while any panel
+    // exists. The island loads one only while open and the drawer page only
+    // while shown, so counting instances is the whole gate, and two of them
+    // never clear it under each other.
+    Component.onCompleted: Perf.viewers++
+    Component.onDestruction: Perf.viewers--
+
     function pct(part, whole) { return part === null || !whole ? null : 100 * part / whole; }
     function last(list) { return list.length ? list[list.length - 1] : null; }
     // Conky's glyphs, re-checked in Inconsolata Nerd Font.