feat(theme): shift palette from indigo to deep violet + muted gold

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/assets/theme.css

@@ -10,17 +10,17 @@
   --color-text-muted: #999999;
   --color-border: #dddde8;
   --color-input-border: #c8c8d8;
-  --color-primary: #6366f1;
+  --color-primary: #7c3aed;
   --color-danger: #d93025;
-  --color-tag-bg: #ede9fe;
+  --color-tag-bg: #ede5ff;
-  --color-tag-text: #4f46e5;
+  --color-tag-text: #6d28d9;
   --color-shadow: rgba(0, 0, 0, 0.08);
   --color-toast-success: #34a853;
   --color-toast-error: #d93025;
   --color-status-todo: #5f6368;
   --color-status-todo-bg: #e8eaed;
-  --color-status-in-progress: #6366f1;
+  --color-status-in-progress: #7c3aed;
-  --color-status-in-progress-bg: #ede9fe;
+  --color-status-in-progress-bg: #ede5ff;
   --color-status-done: #34a853;
   --color-status-done-bg: #e6f4ea;
   --color-priority-low: #5f9ea0;
@@ -44,38 +44,42 @@
   --color-bubble-user-bg: rgba(0, 0, 0, 0.04);
   --color-bubble-user-border: rgba(0, 0, 0, 0.10);
   --color-bubble-user-text: #3a3a4a;
-  --color-bubble-asst-shadow: 0 2px 16px rgba(99, 102, 241, 0.10), 0 1px 4px rgba(0, 0, 0, 0.06);
+  --color-bubble-asst-shadow: 0 2px 16px rgba(124, 58, 237, 0.10), 0 1px 4px rgba(0, 0, 0, 0.06);
   --radius-sm: 6px;
   --radius-md: 12px;
   --radius-lg: 18px;
   --radius-pill: 9999px;
-  --focus-ring: 0 0 0 2px color-mix(in srgb, var(--color-primary) 40%, transparent);
+  --focus-ring: 0 0 0 2px rgba(124, 58, 237, 0.4);
   /* Layout */
   --page-max-width: 1200px;
   --page-padding-x: 1rem;
   --sidebar-width: 260px;
+  --color-accent-warm: #b8860b;
+  --color-accent-warm-light: #d4a017;
+  --color-primary-solid: #7c3aed;
+  --color-primary-deep: #5b21b6;
 }
 
 [data-theme="dark"] {
-  --color-bg: #111113;
+  --color-bg: #0f0f14;
-  --color-bg-secondary: #18181f;
+  --color-bg-secondary: #16161f;
-  --color-bg-card: #1e1e27;
+  --color-bg-card: #1a1a24;
-  --color-surface: #1a1b22;
+  --color-surface: #16161f;
   --color-text: #e4e4f0;
   --color-text-secondary: #8888a8;
   --color-text-muted: #52526a;
-  --color-border: rgba(99, 102, 241, 0.10);
+  --color-border: rgba(124, 58, 237, 0.12);
-  --color-input-border: rgba(99, 102, 241, 0.22);
+  --color-input-border: rgba(124, 58, 237, 0.22);
-  --color-primary: #818cf8;
+  --color-primary: #a78bfa;
   --color-danger: #f44336;
   --color-tag-bg: #2a2a45;
-  --color-tag-text: #a5b4fc;
+  --color-tag-text: #c4b5fd;
   --color-shadow: rgba(0, 0, 0, 0.4);
   --color-toast-success: #4caf50;
   --color-toast-error: #f44336;
   --color-status-todo: #9aa0a6;
   --color-status-todo-bg: #2a2a35;
-  --color-status-in-progress: #818cf8;
+  --color-status-in-progress: #a78bfa;
   --color-status-in-progress-bg: #2a2a45;
   --color-status-done: #4caf50;
   --color-status-done-bg: #1b3a20;
@@ -88,19 +92,23 @@
   --color-wikilink: #c4b5fd;
   --color-wikilink-bg: #2a1a45;
   --color-overdue: #f44336;
-  --color-code-bg: #16161d;
+  --color-code-bg: #12121a;
-  --color-code-inline-bg: #1e1e2d;
+  --color-code-inline-bg: #1a1a2a;
-  --color-table-stripe: #16161e;
+  --color-table-stripe: #14141e;
   --color-success: #4ade80;
   --color-warning: #facc15;
-  --color-input-bar-bg: #1e1e27;
+  --color-input-bar-bg: #1a1a24;
   --color-input-bar-text: #e4e4f0;
   --color-input-bar-placeholder: rgba(228, 228, 240, 0.35);
   --color-overlay: rgba(0, 0, 0, 0.65);
   --color-bubble-user-bg: rgba(255, 255, 255, 0.04);
   --color-bubble-user-border: rgba(255, 255, 255, 0.10);
   --color-bubble-user-text: #b0b0c8;
-  --color-bubble-asst-shadow: 0 4px 28px rgba(99, 102, 241, 0.14), 0 2px 8px rgba(0, 0, 0, 0.4);
+  --color-bubble-asst-shadow: 0 4px 28px rgba(124, 58, 237, 0.14), 0 2px 8px rgba(0, 0, 0, 0.4);
+  --color-accent-warm: #d4a017;
+  --color-accent-warm-light: #e8c45a;
+  --color-primary-solid: #7c3aed;
+  --color-primary-deep: #5b21b6;
 }
 
 *,
@@ -168,11 +176,11 @@ button:not(:disabled):active,
   background: transparent;
 }
 ::-webkit-scrollbar-thumb {
-  background: rgba(99, 102, 241, 0.25);
+  background: rgba(124, 58, 237, 0.25);
   border-radius: 9999px;
 }
 ::-webkit-scrollbar-thumb:hover {
-  background: rgba(99, 102, 241, 0.45);
+  background: rgba(124, 58, 237, 0.45);
 }
 
 /* Floating inline assist button (teleported to body, cannot be scoped) */

frontend/src/components/AppLogo.vue

@@ -11,6 +11,12 @@ defineProps<{ size?: number }>();
     :height="size ?? 24"
     aria-hidden="true"
   >
+    <defs>
+      <linearGradient id="logo-gradient" x1="0" y1="0" x2="1" y2="1">
+        <stop offset="0%" stop-color="var(--color-primary-solid)" />
+        <stop offset="100%" stop-color="var(--color-primary-deep)" />
+      </linearGradient>
+    </defs>
     <!-- Book body -->
     <path class="logo-book" d="M4 7 C4 7 8 5 16 6 C24 5 28 7 28 7 L28 26 C28 26 24 24 16 25 C8 24 4 26 4 26 Z" stroke-width="0.5"/>
     <!-- Book spine -->
@@ -37,7 +43,7 @@ defineProps<{ size?: number }>();
 
 <style scoped>
 .logo-book {
-  fill: var(--color-primary);
+  fill: url(#logo-gradient);
   stroke: color-mix(in srgb, var(--color-primary) 70%, transparent);
 }
 .logo-spine {