fix(app): resolve Bucket B (type safety) lint items

WS-3 session 1b-ii Task 3 (audit Bucket B — 34 items: 21 absorbed
via ignorePatterns + 14 real fixes; the count of 21 is the actual
non-Tier-3 lint-count drop from the .eslintrc edit, slightly above
the audit's predicted 20 because additional vendored-Vuexy items
beyond the 23 no-explicit-any landed in those paths too).

Config:
- .eslintrc.cjs: add src/@core/** and src/@layouts/** to ignorePatterns.
  Vendored Vuexy code, precedent: src/plugins/iconify/*.js. The
  CLAUDE.md no-any rule remains in force for our own code under src/.

Real type-safety fixes:
- B.1 ref<any> in our code (3 occurrences):
  * blank.vue / default.vue: AppLoadingIndicator template ref now
    typed as InstanceType<typeof AppLoadingIndicator> | null. Picks
    up the defineExpose'd fallbackHandle / resolveHandle methods.
  * NavSearchBar.vue:109: useApi<any>(...) → useApi<SearchResults[]>(...)
    matching the existing searchResult ref type.
- B.2 ShiftDetailPanel.vue: moved the Cancel-dialog ref declarations
  (isCancelDialogOpen, cancellingAssignment) from line 305-307 to
  line 248 — directly above the onCancel handler that uses them.
  Resolves all 7 no-use-before-define items in one move. Same-file,
  no logic change.
- B.3 useImpersonationStore.ts:119: renamed inner 'stored' to
  'storedSnapshot' to resolve shadowing of the outer 'stored' on
  line 18.
- B.4 useFormSchemas.ts:97-99: renamed local mutationFn parameter
  'confirmed_name' to camelCase 'confirmedName'. Wire-format key
  stays snake_case via destructure-alias:
    params: confirmedName ? { confirmed_name: confirmedName } : undefined
  No callers found in apps/app/src — safe rename.

Tests + typecheck verified green.

Lint baseline: 97 → 62.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/app/src/components/shifts/ShiftDetailPanel.vue

@@ -245,6 +245,10 @@ function executeApprove(assignment: ShiftAssignment) {
   })
 }
 
+// Cancel dialog
+const isCancelDialogOpen = ref(false)
+const cancellingAssignment = ref<ShiftAssignment | null>(null)
+
 function onCancel(assignment: ShiftAssignment) {
   cancellingAssignment.value = assignment
   isCancelDialogOpen.value = true
@@ -302,10 +306,6 @@ function onRejectExecute() {
   )
 }
 
-// Cancel dialog
-const isCancelDialogOpen = ref(false)
-const cancellingAssignment = ref<ShiftAssignment | null>(null)
-
 // Bulk approve dialog
 const isBulkApproveDialogOpen = ref(false)