refactor(frontend): the second sweep — scoped rules that no longer match their own template (#2962)

The first sweep asked "does this class token appear anywhere outside a
<style> block?". That is too generous for a `<style scoped>` rule, which can
only ever match its own template, the component's root element, or whatever
`:deep()` reaches — so a scoped rule whose name lives only in some OTHER file
is dead regardless. The server's map had this right and my local pass did
not; this closes the gap.

79 scoped classes are absent from their own file. 48 are names their own file
BUILDS — `status-${task.status}`, `pri-${p}`, `toast--${type}`,
`perm-${permission}`, `diff-${op}`, `is-${kind}` — and 12 more are Vue
transition classes. Those are the map's documented blind spot and they stay.
The remaining 19 match nothing:

- AppHeader (9, -39 lines): the whole connection-status indicator —
  .status-indicator/.status-dot/.status-text and the five colour states,
  plus @keyframes pulse-dot and status-pulse, which had no other user. Same
  Phase 7 residue as the last commit. `.btn-icon.active` goes too: `active`
  is never applied in this component (its nav uses router-link-active).
- SettingsView (6): .status-badge/.status-on/.status-off,
  .perm-granted/.perm-denied, .location-row. This view renders no child
  components at all, so nothing can inherit its scope.
- WorkspaceNoteEditor: .note-row:hover .btn-delete and .btn-suggest-tags —
  those buttons are .btn-danger-outline/.btn-ghost now.
- ProjectListView .loading-msg; SnippetEditorView .field-row.three, whose
  media-query companion keeps its live .field-row half.

Checked against child-component roots before deleting, since a child's root
element does inherit the parent's scope id — none of the 19 is one. Template
and script regions byte-identical; both style checks still pass with only
the six pre-existing reports.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/views/ProjectListView.vue

@@ -366,12 +366,6 @@ function overallPct(project: Project): { total: number; pct: number } {
   border-bottom-color: var(--fs-accent);
   font-weight: 500;
 }
-
-.loading-msg {
-  color: var(--fs-text-tertiary);
-  font-size: 0.9rem;
-  margin-top: 1rem;
-}
 .error-msg {
   margin-top: 1rem;
 }