feat(modal): autofocus tag input, expand general suggestions, retire copyright/artist categories

Four coupled operator-asked changes to the view modal (Scribe plan #509):

1. **Autofocus tag entry on modal open** — TagAutocomplete grabs focus
   in onMounted/nextTick so the caret is in the input the moment the
   modal renders. No click needed to start typing.

2. **General suggestions expanded by default** — SuggestionsPanel's
   general-category group now mounts with `:default-open="true"`.
   Operator can collapse if too noisy, but the v1 frame shows them.

3. **Lower general threshold default 0.95 → 0.50** — MLSettings.
   suggestion_threshold_general default matches character. Alembic
   0029 also bumps the existing singleton row's value if it's still
   at the old 0.95. Operator can re-tune from Settings → ML.

4. **Retire `copyright` + `artist` as ML suggestion categories** —
   neither feeds a Tag.kind (`artist` retired in FC-2d-vii-c, never
   really existed as a copyright tag-kind). They were surfaced in the
   suggestions pipeline + threshold settings UI but had no follow-
   through. Drop from SURFACED_CATEGORIES, suggestions._threshold_for,
   ml_admin GET/PATCH allowlist, MLSettings columns (alembic 0029
   drops the two columns), frontend CATEGORY_ORDER + CATEGORY_LABELS,
   SuggestionsPanel.peopleCats, AliasPickerDialog kind-check, and
   MLThresholdSliders rows.

Out of scope (intentional): `tag_kind` Postgres enum still includes
`artist` for historic Tag row queryability (per the model comment);
no operator pain reported, no enum-shrink needed.

Tests:
- test_surfaced_categories asserts {character, general}, excludes
  artist + copyright.
- test_threshold_for_artist_is_unsurfaced extended to cover copyright.
- test_get_and_patch_settings asserts new 0.50 default and the absent
  artist + copyright keys in the GET payload.

frontend/src/components/modal/AliasPickerDialog.vue

@@ -48,10 +48,11 @@ function onSearch(q) {
     if (!query) { results.value = []; return }
     loading.value = true
     try {
-      // Scope the autocomplete to the prediction's category where it maps
-      // to a tag kind. 'copyright' has no tag kind; search unscoped there.
-      const kind = ['artist', 'character'].includes(props.category)
-        ? props.category : null
+      // Scope the autocomplete to the prediction's category where it
+      // maps to a tag kind. Only 'character' surfaces as both a
+      // suggestion category and a tag kind now ('artist' + 'copyright'
+      // retired); other categories search unscoped.
+      const kind = props.category === 'character' ? 'character' : null
       const params = { q: query, limit: 20 }
       if (kind) params.kind = kind
       results.value = await api.get('/api/tags/autocomplete', { params })

frontend/src/components/modal/SuggestionsPanel.vue

@@ -22,7 +22,7 @@
       <SuggestionsCategoryGroup
         v-if="store.byCategory.general && store.byCategory.general.length"
         label="General" :items="store.byCategory.general"
-        collapsible :default-open="false"
+        collapsible :default-open="true"
         @accept="onAccept" @alias="onAlias" @dismiss="store.dismiss"
       />
     </template>
@@ -47,7 +47,10 @@ import AliasPickerDialog from './AliasPickerDialog.vue'
 const props = defineProps({ imageId: { type: Number, required: true } })
 const store = useSuggestionsStore()
 
-const peopleCats = ['artist', 'character', 'copyright']
+// 'artist' (FC-2d-vii-c) and 'copyright' (2026-06-01) retired as
+// suggestion categories. Only 'character' remains as a people-style
+// category alongside the general bucket.
+const peopleCats = ['character']
 function labelFor(c) { return CATEGORY_LABELS[c] || c }
 
 const isEmpty = computed(() =>

frontend/src/components/modal/TagAutocomplete.vue

@@ -1,6 +1,7 @@
 <template>
   <div class="fc-tag-autocomplete">
     <v-text-field
+      ref="inputRef"
       v-model="query"
       placeholder="Add tag (or kind:name — character/fandom/series)"
       density="compact" hide-details
@@ -52,13 +53,21 @@
 </template>
 
 <script setup>
-import { computed, ref, watch } from 'vue'
+import { computed, nextTick, onMounted, ref, watch } from 'vue'
 import { useTagStore } from '../../stores/tags.js'
 import FandomPicker from './FandomPicker.vue'
 
 const emit = defineEmits(['pick-existing', 'pick-new', 'cancel'])
 const store = useTagStore()
 
+// Autofocus on modal open so the operator can type the moment the view
+// modal renders, no extra click required (operator-asked 2026-06-01).
+// Vuetify's v-text-field exposes .focus() on the component instance;
+// nextTick waits for the modal's mount to finish so the inner <input>
+// element exists.
+const inputRef = ref(null)
+onMounted(() => { nextTick(() => inputRef.value?.focus?.()) })
+
 // Single text input; no kind dropdown. Client-side mirror of the
 // backend's parse_kind_prefix lives below — kept in sync with
 // KNOWN_KINDS in backend/app/utils/tag_prefix.py. The backend is the

frontend/src/components/settings/MLThresholdSliders.vue

@@ -22,10 +22,10 @@ import { reactive, watch } from 'vue'
 import { useMLStore } from '../../stores/ml.js'
 
 const store = useMLStore()
+// 'artist' (FC-2d-vii-c) and 'copyright' (2026-06-01) retired as
+// suggestion categories; their threshold rows are gone.
 const fields = [
-  { key: 'suggestion_threshold_artist', label: 'Artist' },
   { key: 'suggestion_threshold_character', label: 'Character' },
-  { key: 'suggestion_threshold_copyright', label: 'Copyright' },
   { key: 'suggestion_threshold_general', label: 'General' },
   { key: 'centroid_similarity_threshold', label: 'Centroid similarity' }
 ]