feat(KB-625): add industrial color theme

- Add industrial to COLOR_THEMES array in types.ts
- Add industrial theme CSS definitions with dark grunge aesthetic
- Add industrial theme selector entry in ThemeSelector component
- Add industrial theme swatch styles for preview

packages/dashboard/app/styles.css

@@ -5833,6 +5833,47 @@ html .column.drag-over * {
   --color-error: #cc0000;
 }
 
+/* INDUSTRIAL - Technical engineering spec sheet aesthetic */
+[data-color-theme="industrial"] {
+  --bg: #0c0c0c;
+  --surface: #141414;
+  --card: #1a1a1a;
+  --card-hover: #222222;
+  --border: #333333;
+  --text: #e8e8e8;
+  --text-muted: #888888;
+  --text-dim: #555555;
+
+  --todo: #ff6b00;
+  --in-progress: #ff8c00;
+  --in-progress-rgb: 255, 140, 0;
+  --in-review: #00bcd4;
+  --triage: #ff5722;
+  --done: #666666;
+  --color-success: #00bcd4;
+  --color-error: #ff3d00;
+}
+
+[data-color-theme="industrial"][data-theme="light"] {
+  --bg: #f0f0f0;
+  --surface: #fafafa;
+  --card: #ffffff;
+  --card-hover: #f5f5f5;
+  --border: #d0d0d0;
+  --text: #1a1a1a;
+  --text-muted: #666666;
+  --text-dim: #999999;
+
+  --todo: #e65100;
+  --in-progress: #ef6c00;
+  --in-progress-rgb: 239, 108, 0;
+  --in-review: #0097a7;
+  --triage: #d84315;
+  --done: #555555;
+  --color-success: #0097a7;
+  --color-error: #d84315;
+}
+
 /* SOLARIZED - Classic solarized palette */
 [data-color-theme="solarized"] {
   --bg: #002b36;
@@ -6281,6 +6322,11 @@ html .column.drag-over * {
   --surface: #0a0a0a;
 }
 
+.theme-swatch-industrial {
+  --bg: #0c0c0c;
+  --surface: #1a1a1a;
+}
+
 .theme-swatch-solarized {
   --bg: #002b36;
   --surface: #073642;