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/components/WorkspaceNoteEditor.vue

@@ -471,7 +471,6 @@ defineExpose({ reload: loadProjectNotes });
   flex: 1;
 }
 
-
 .rail-search-input {
   flex: 1;
   background: transparent;
@@ -575,8 +574,6 @@ defineExpose({ reload: loadProjectNotes });
   align-items: center;
 }
 
-.note-row:hover .btn-delete { opacity: 1; }
-
 /* Editor UI */
 .panel-header {
   display: flex;
@@ -624,8 +621,6 @@ defineExpose({ reload: loadProjectNotes });
 }
 .tag-row > :first-child { flex: 1; min-width: 0; }
 
-.btn-suggest-tags { flex-shrink: 0; align-self: center; }
-
 .tag-suggestions {
   display: flex;
   flex-wrap: wrap;
@@ -653,7 +648,6 @@ defineExpose({ reload: loadProjectNotes });
   color: var(--fs-accent);
 }
 
-
 .link-suggest-strip {
   display: flex;
   align-items: center;