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>

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+# clipboard
+
+The clipboard history as a drawer page, replacing the rofi list. The history
+itself is cliphist's, fed by `wl-paste --watch cliphist store` from autostart;
+this module only reads and edits it. CTRL+SHIFT+L opens the drawer straight on
+this page (`ipc call drawer open clipboard`).
+
+- The search field has focus on open and filters as you type, ignoring case.
+- Up and Down move the highlight; Enter or a click copies the entry and closes
+  the drawer.
+- `×` on a row deletes that entry; "Clear all" asks once more ("Confirm?",
+  3 seconds) and then runs `cliphist wipe`.
+
+Nothing runs while the drawer is closed: the page runs `cliphist list` when
+it opens. 750 entries measured, 42 of them images.
+
+**Entries are untrusted text.** Copy and delete pass the cliphist line to
+`sh -c` as `$1` and print it into `cliphist decode` or `cliphist delete`; it
+never becomes part of a command string.
+
+**Images show as thumbnails.** A row whose preview is cliphist's
+`[[ binary data <size> <type> <WxH> ]]` decodes the entry once into
+`$XDG_RUNTIME_DIR/qs-clip/<id>.png` and reuses the file after. That directory
+is tmpfs, so a reboot clears it. The list is a `ListView`, so only rows that
+are created decode.
+
+`Clip.js` holds the parsing and the filter, tested with:
+
+    node desktop/modules/clipboard/test_clip.js