fix(typography): strip chrome italic; reserve italic for emphasis

Per the design rule "italic is for emphasis, not for design", removed
every chrome `font-style: italic` declaration across the frontend.
42 declarations gone across 24 files: empty-state placeholder copy,
loading messages, "no results" hints, ghost text, voice/role labels,
field placeholder text, brand wordmark, et al.

Markdown content emphasis is unaffected — `<em>` and `<i>` tags from
`*emphasis*` markup still render italic via browser default styling
(prose.css doesn't override em behavior). User-typed emphasis in
notes, journal entries, and chat messages keeps its italic.

Specific spots that lost the decorative italic:

- KnowledgeView .filter-label, .empty-narrator
- NoteEditorView .ef-label, link-suggest related
- ChatPanel .empty-msg, .empty-greeting, .role-label
- ChatMessage .role-assistant .role-label (the "Fable" voice tag —
  was italic per the doc's Illuminated Transcript spec, but per the
  new typography rule the speaker tag stays regular and lets the
  border-left + glow do the bubble framing on their own)
- AppHeader .brand-text ("Fabled" wordmark)
- editor-shared.css .title-input::placeholder
- ProjectView .project-title-input::placeholder
- HomeView .urgency-loading
- WorkspaceTaskPanel .empty-group
- WeatherCard .weather-unavailable
- SharedWithMeView .empty-msg
- DiffView empty-state spans
- ToolCallCard .tool-event-more
- SettingsView 7 spots (.you-label, .geo-pending, hint text, etc.)
- + several other empty-state / hint text spots

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

frontend/src/views/SettingsView.vue

@@ -3323,7 +3323,6 @@ FABLE_API_KEY={{ effectiveApiKey }}</pre>
   border-radius: 4px;
 }
 .not-configured {
-  font-style: italic;
   opacity: 0.75;
 }
 .search-row {
@@ -3421,7 +3420,6 @@ FABLE_API_KEY={{ effectiveApiKey }}</pre>
 .push-unsupported {
   font-size: 0.875rem;
   color: var(--color-text-muted);
-  font-style: italic;
 }
 .push-status-row {
   display: flex;
@@ -3567,7 +3565,7 @@ FABLE_API_KEY={{ effectiveApiKey }}</pre>
   color: var(--color-text-muted);
   background: var(--color-bg-secondary);
 }
-.you-label { font-size: 0.8rem; color: var(--color-text-muted); font-style: italic; }
+.you-label { font-size: 0.8rem; color: var(--color-text-muted); }
 /* Per-row delete (users / invitations / etc.): ghost → Oxblood on hover */
 .btn-delete {
   padding: 0.25rem 0.6rem;
@@ -3772,7 +3770,6 @@ FABLE_API_KEY={{ effectiveApiKey }}</pre>
 
 .loading-msg, .empty-msg {
   color: var(--color-text-muted);
-  font-style: italic;
   font-size: 0.88rem;
   padding: 0.5rem 0;
 }
@@ -3934,7 +3931,6 @@ FABLE_API_KEY={{ effectiveApiKey }}</pre>
 
 .members-empty {
   color: var(--color-text-muted);
-  font-style: italic;
   font-size: 0.82rem;
   padding: 0.25rem 0.5rem;
 }
@@ -3951,7 +3947,7 @@ FABLE_API_KEY={{ effectiveApiKey }}</pre>
 }
 .geo-ok { color: var(--color-success); }
 .geo-error { color: var(--color-danger); }
-.geo-pending { color: var(--color-text-muted); font-style: italic; }
+.geo-pending { color: var(--color-text-muted); }
 
 .unit-toggle {
   display: flex;
@@ -4324,7 +4320,6 @@ FABLE_API_KEY={{ effectiveApiKey }}</pre>
 .learned-empty {
   font-size: 0.85rem;
   color: var(--color-text-muted);
-  font-style: italic;
   margin-bottom: 0.75rem;
 }
 .btn-danger-outline {