feat(perf): the performance page moves to the drawer, with ~/.cache

The island's performance icon and panel are gone: the drawer page covers
them. With only one host left, the panel drops its three-column grid for
one card per row at a larger size, since the page scrolls; temperatures
get a card of their own as tiles. The files move from island/perf to
modules/perf.

A cache card ports conky's: ~/.cache and its five largest children,
measured with du each time the page opens (28ms over 2 GiB here) rather
than read from conky's 15-minute sampler file. The largest is yellow,
red past half the total, as conky had it.

The warning dot now shows only on the drawer tile.

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

1 files changed, 14 insertions, 0 deletions

diff --git a/desktop/modules/perf/Perf.js b/desktop/modules/perf/Perf.js
index b853f50..d84c694 100644
--- a/desktop/modules/perf/Perf.js
+++ b/desktop/modules/perf/Perf.js
@@ -72,6 +72,20 @@ function df(text) {
     return out;
 }
 
+// `du -B1 -d1 <dir>`: {total, items} with items largest first by basename,
+// or null when du printed nothing. du prints the directory itself last, and
+// it is also the largest line, so the total is the maximum.
+function du(text) {
+    const rows = [];
+    for (const line of text.split("\n")) {
+        const m = /^(\d+)\t(.*)$/.exec(line);
+        if (m) rows.push({ name: m[2].replace(/.*\//, ""), bytes: Number(m[1]) });
+    }
+    if (!rows.length) return null;
+    rows.sort((x, y) => y.bytes - x.bytes);
+    return { total: rows[0].bytes, items: rows.slice(1) };
+}
+
 // VRAM in bytes from the fdinfo scan: drm-resident-vram0 of every xe fd,
 // counted once per drm-client-id because a client holds several fds.
 function vram(text) {