Gate firmware auto-check behind control+CSRF; skip faces with a null bounding box

/api/frames/{id}/firmware/check could silently stage new firmware as a
side effect (the auto-apply path, when firmware_auto_update is on and
a newer release exists) but was gated by require_frame_view instead of
require_frame_control like its sibling firmware routes, and being a
GET, was exempt from the app's CSRF check (which only applies to
non-GET/HEAD/OPTIONS). A linked viewer without control -- or a
cross-site page riding a control-holding victim's session via a plain
GET -- could trigger an unreviewed firmware install. Now POST +
require_frame_control, matching /firmware/apply-latest; the frontend's
two callers (passive poll on page load, "Check now" button) both
already handle a 409 from a non-controller gracefully via the existing
apiError()/control-banner pattern, so this doesn't change UX for a
frame's actual controller.

Separately: Immich has been observed to return a face detection entry
with a null bounding-box field (a still-pending or otherwise
incomplete detection). Both places that do arithmetic on those fields
-- image_pipeline._face_aware_crop_box (crop_faces display mode) and
face_labels.compute_face_labels (manage-menu name labels) -- crashed
with an unhandled TypeError on such an entry, taking down that frame's
whole photo instead of the intended graceful fallback. Both now skip
any face missing a bounding-box field via a shared _has_bounding_box()
check; a face list with zero valid entries already degrades cleanly to
the plain center crop (the existing inf/-inf sentinel math already
handled "no faces" correctly, it just couldn't tell "none passed
Immich" apart from "one broken entry" before).

server/app/static/frame_config.js

@@ -259,7 +259,7 @@ async function loadFirmwareCheck(force) {
   const btn = document.getElementById('firmware-update-btn');
   const boardEl = document.getElementById('firmware-board');
   try {
-    const resp = await fetch(`${window.FRAME_API}/firmware/check` + (force ? '?force=true' : ''));
+    const resp = await fetch(`${window.FRAME_API}/firmware/check` + (force ? '?force=true' : ''), { method: 'POST' });
     if (!resp.ok) {
       if (force) {
         showStatus(false, await apiError(resp));