Replace emoji icons with Lucide icons and soften link colors

Replaced emoji icons throughout the Angular app with modern Lucide icon library for a more professional and consistent look matching the original static site design.

**Icon Updates:**
- Navigation tabs: Database, Upload, Search icons
- Toolbar buttons: RefreshCw, Sparkles, Search, X icons
- Action buttons: Download, Trash2 icons
- Form buttons: Upload, Search, X icons

**Style Improvements:**
- Added softer blue color for artifact links (#93c5fd)
- Added hover effect with lighter blue (#bfdbfe)
- Added proper cursor pointer for clickable rows
- Improved icon color consistency throughout

**Dependencies:**
- Added lucide-angular (v0.545.0) for icon support
- Bundle size: 356.54 kB (raw) → 93.91 kB (gzipped)
- Minimal impact: only +7.79 kB for full icon library

All components updated with Lucide imports and icon references.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/src/styles.css

@@ -524,6 +524,28 @@ code {
     stroke: currentColor;
 }
 
+/* Artifact link styles - softer blue */
+.artifact-link {
+    color: #93c5fd;
+    text-decoration: none;
+    transition: color 0.3s;
+}
+
+.artifact-link:hover {
+    color: #bfdbfe;
+    text-decoration: underline;
+}
+
+/* Clickable row cursor */
+tr.clickable {
+    cursor: pointer;
+}
+
+/* Search icon color */
+.search-icon {
+    color: #64748b;
+}
+
 @media (max-width: 768px) {
     .form-row {
         grid-template-columns: 1fr;