fix(typography): bump italic-Fraunces section/field labels to readable size

KnowledgeView's "Type" / "Tags" filter section headers (.filter-label)
and NoteEditorView's entity-field labels (.ef-label — Email, Phone,
Address etc on person/place notes) were using italic Fraunces accent
at 0.72rem / 0.78rem. The italic + small + decorative-serif combo
read as illegible flourish rather than functional section headers.

Bumped:
- .filter-label 0.72rem → 0.95rem, margin-bottom 6px → 8px
- .ef-label 0.78rem → 0.92rem

Italic Fraunces accent preserved (keeps the branded character that
matches the rest of the surface). Just enlarged to a readable size.

ChatMessage's .role-assistant .role-label kept at 0.8rem italic
Fraunces — that's the doc's Illuminated Transcript voice label, a
decorative speaker tag rather than a functional heading.

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

frontend/src/views/KnowledgeView.vue

@@ -794,10 +794,9 @@ onUnmounted(() => {
 .filter-label {
   font-family: 'Fraunces', Georgia, serif;
   font-style: italic;
-  font-size: 0.72rem;
-  letter-spacing: 0.02em;
+  font-size: 0.95rem;
   color: var(--color-primary);
-  margin-bottom: 6px;
+  margin-bottom: 8px;
   padding: 0 4px;
 }
 /* ── New item button ─────────────────────────────────────── */

frontend/src/views/NoteEditorView.vue

@@ -1037,7 +1037,7 @@ onUnmounted(() => assist.clearSelection());
 .ef-label {
   font-family: 'Fraunces', Georgia, serif;
   font-style: italic;
-  font-size: 0.78rem;
+  font-size: 0.92rem;
   color: var(--color-primary);
 }
 .ef-input {