fix serve recipe: filter output to Development Server start + [200] requests only

refactor: unify CSS color variables across public and admin

- Replace old variable structure with new standardized naming:
  - Background: --bg-primary, --bg-secondary, --bg-tertiary, --bg-active
  - Text: --text-primary, --text-secondary, --text-tertiary
  - Border: --border-primary, --border-secondary
  - Status: --success, --error, --warning
  - Accent: --accent-primary, --accent-secondary, --accent-foreground, --accent-muted
- Remove admin-specific color variables (--admin-*)
- Update all CSS files to use shared variables:
  - variables.css, common.css, main.css, admin.css
  - tfe.css, search.css, apropos.css, system.css, colors.css

public/assets/css/variables.css

@@ -0,0 +1,36 @@
+/* ============================================================
+   CSS VARIABLES (CUSTOM PROPERTIES)
+   ============================================================ */
+
+:root {
+  /* Public / Light theme */
+  --bg-primary: #ffffff;
+  --bg-secondary: #f5f5f5;
+  --bg-tertiary: #e8e8e8;
+  --bg-active: #d0d0d0;
+  --text-primary: #111111;
+  --text-secondary: #666666;
+  --text-tertiary: #999999;
+  --border-primary: #ddd;
+  --border-secondary: #ccc;
+  
+  /* Admin / Dark theme */
+  --admin-bg: #1a1a1a;
+  --admin-bg-alt: #242424;
+  --admin-text: #e8e8e8;
+  --admin-text-muted: #969696;
+  --admin-border: #555;
+  
+  /* Shared colors */
+  --success: #5cd69d;
+  --error: #f25a5a;
+  --warning: #fbca51;
+  --accent-primary: #9557b5;
+  --accent-secondary: #683d7f;
+  --accent-foreground: #ffffff;
+  --accent-muted: rgba(149, 87, 181, 0.12);
+  --gradient-start: #3C856C;
+  --gradient-2: #60ECB4;
+  --gradient-3: #E390FF;
+  --gradient-4: #9557B5;
+}