fix(settings): maintenance tiles start collapsed; remember manual open state

GpuAgentCard was hardcoded :open=true, HeadsCard opened whenever any head
existed, TagEvalCard whenever a persisted run existed — so a fresh Settings
load greeted the operator with several tiles already expanded. All three now
force-open only while their task is actually running (the #877 resurface
behavior on the busy-driven tiles is untouched).

MaintenanceTile additionally persists MANUAL expand/collapse per tile in
localStorage, so the section reloads the way the operator left it; a forced
open while a task runs stays transient and is never saved as a preference.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM

frontend/src/components/common/MaintenanceTile.vue

@@ -7,8 +7,10 @@
 
   Usage: wrap a card's action body in the default slot; pass icon/title/blurb.
   `destructive` tints the icon error-red for delete actions. `open` can be forced
-  (e.g. keep a running task's tile expanded). Keyboard accessible: the header is a
-  real <button> with aria-expanded + focus ring.
+  (e.g. keep a running task's tile expanded). Manual expand/collapse persists per
+  tile in localStorage, so the page reloads the way the operator left it.
+  Keyboard accessible: the header is a real <button> with aria-expanded + focus
+  ring.
 -->
 <template>
   <v-card class="fc-tile" :class="{ 'fc-tile--open': isOpen }">
@@ -53,12 +55,21 @@ const props = defineProps({
   open: { type: Boolean, default: false },
 })
 
-const local = ref(props.open)
-watch(() => props.open, (v) => { local.value = v })
+// Only MANUAL toggles are saved (keyed by tile title): a forced `open` while a
+// task is mid-run is transient state, not a preference — persisting it would
+// resurrect the "several tiles open by default" bug this replaces. When the
+// force clears, the tile falls back to the operator's saved choice.
+const storeKey = `fc.tile.${props.title}`
+function savedOpen() {
+  try { return localStorage.getItem(storeKey) === '1' } catch { return false }
+}
+const local = ref(props.open || savedOpen())
+watch(() => props.open, (v) => { local.value = v || savedOpen() })
 const isOpen = computed(() => local.value)
 
 function toggle() {
   local.value = !local.value
+  try { localStorage.setItem(storeKey, local.value ? '1' : '0') } catch { /* non-fatal */ }
 }
 </script>