feat(design): foundation pass — dusty violet palette, warm parchment light, Inter + JetBrains Mono

Applies the FabledSword + Scribe iteration palette to theme.css end to
end: indigo (#7c3aed) → dusty violet (#5B4A8A) accent, cool grey →
Obsidian/Iron/Pewter dark surfaces, warm parchment (#F5F1E8) light
mode, Inter body + JetBrains Mono code loaded alongside Fraunces, and
neutral hairline scrollbars (chrome is structural, not branded).

Adds the action token set (--color-action-primary Moss,
--color-action-secondary Bronze, --color-action-destructive Oxblood,
--color-action-ghost-border Pewter) but does not yet reclassify any
buttons — surface-phase work. Buttons remain dusty-violet gradients in
the meantime, by design.

Removes deprecated --color-accent-warm; replaces concrete usages with
--color-text-secondary (dates, flavor copy) or --color-warning (paused
status). Sweeps hardcoded indigo literals in component scoped CSS so
they don't bypass the token system.

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

frontend/src/views/KnowledgeView.vue

@@ -720,17 +720,17 @@ onUnmounted(() => {
   gap: 5px;
   padding: 3px 10px;
   border-radius: 20px;
-  background: rgba(124, 58, 237, 0.1);
-  border: 1px solid rgba(124, 58, 237, 0.2);
+  background: rgba(91, 74, 138, 0.1);
+  border: 1px solid rgba(91, 74, 138, 0.2);
   color: var(--color-text);
   text-decoration: none;
   transition: background 0.15s;
 }
-.today-event-chip:hover { background: rgba(124, 58, 237, 0.18); }
+.today-event-chip:hover { background: rgba(91, 74, 138, 0.18); }
 .chip-dot {
   width: 6px; height: 6px;
   border-radius: 50%;
-  background: #7c3aed;
+  background: #5B4A8A;
   flex-shrink: 0;
 }
 .chip-date { color: var(--color-muted); font-size: 0.78rem; }
@@ -775,7 +775,7 @@ onUnmounted(() => {
   content: '· · ·';
   display: block;
   text-align: center;
-  color: rgba(124, 58, 237, 0.3);
+  color: rgba(91, 74, 138, 0.3);
   font-size: 0.9rem;
   letter-spacing: 0.4em;
   padding: 4px 0 12px;
@@ -891,7 +891,7 @@ onUnmounted(() => {
   flex-shrink: 0;
 }
 .filter-btn.active .filter-count {
-  background: rgba(124, 58, 237, 0.2);
+  background: rgba(91, 74, 138, 0.2);
   color: var(--color-primary);
 }
 .filter-tag { font-size: 0.78rem; }
@@ -965,7 +965,7 @@ onUnmounted(() => {
 .btn-graph:hover { color: var(--color-text); border-color: rgba(255,255,255,0.2); }
 .btn-graph.active {
   background: var(--color-primary-wash);
-  border-color: rgba(124, 58, 237, 0.35);
+  border-color: rgba(91, 74, 138, 0.35);
   color: var(--color-primary);
 }
 
@@ -998,12 +998,12 @@ onUnmounted(() => {
 }
 .k-card:hover {
   transform: translateY(-2px);
-  box-shadow: 0 8px 28px rgba(124, 58, 237, 0.25), 0 2px 8px rgba(0, 0, 0, 0.3);
-  border-color: rgba(124, 58, 237, 0.35);
+  box-shadow: 0 8px 28px rgba(91, 74, 138, 0.25), 0 2px 8px rgba(0, 0, 0, 0.3);
+  border-color: rgba(91, 74, 138, 0.35);
 }
 
 /* Type-specific card DNA */
-.k-card--note   { border-color: rgba(124, 58, 237, 0.20); }
+.k-card--note   { border-color: rgba(91, 74, 138, 0.20); }
 .k-card--task   { border-color: rgba(212, 160, 23, 0.18); }
 .k-card--person { border-color: rgba(16, 185, 129, 0.18); }
 .k-card--place  { border-color: rgba(245, 158, 11, 0.18); }
@@ -1022,7 +1022,7 @@ onUnmounted(() => {
 }
 .k-card--note::before {
   right: 0;
-  background: linear-gradient(90deg, #7c3aed, #a78bfa);
+  background: linear-gradient(90deg, #5B4A8A, #7A6DA8);
 }
 .k-card--task::before {
   right: 0;
@@ -1060,7 +1060,7 @@ onUnmounted(() => {
   text-transform: uppercase;
   letter-spacing: 0.04em;
 }
-.badge--note   { background: rgba(99,102,241,0.15); color: #a78bfa; }
+.badge--note   { background: rgba(91, 74, 138,0.15); color: #7A6DA8; }
 .badge--person { background: rgba(16,185,129,0.15); color: #34d399; }
 .badge--place  { background: rgba(245,158,11,0.15); color: #fbbf24; }
 .badge--list   { background: rgba(56,189,248,0.15); color: #7dd3fc; }
@@ -1165,7 +1165,7 @@ onUnmounted(() => {
   background: rgba(255,255,255,0.05);
   color: var(--color-muted);
 }
-.k-card-date { font-size: 0.72rem; color: var(--color-accent-warm); white-space: nowrap; opacity: 0.7; }
+.k-card-date { font-size: 0.72rem; color: var(--color-text-secondary); white-space: nowrap; opacity: 0.7; }
 
 /* ── Task card ──────────────────────────────────────────── */
 .k-card-task {
@@ -1201,7 +1201,7 @@ onUnmounted(() => {
 
 .task-due {
   font-size: 0.78rem;
-  color: var(--color-accent-warm);
+  color: var(--color-text-secondary);
 }
 .task-overdue {
   color: var(--color-overdue);
@@ -1225,7 +1225,7 @@ onUnmounted(() => {
   font-family: 'Fraunces', Georgia, serif;
   font-style: italic;
   font-size: 1rem;
-  color: var(--color-accent-warm);
+  color: var(--color-text-secondary);
   opacity: 0.85;
 }