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/package-lock.json

@@ -14,6 +14,7 @@
         "@angular/forms": "^19.0.0",
         "@angular/platform-browser": "^19.0.0",
         "@angular/router": "^19.0.0",
+        "lucide-angular": "^0.545.0",
         "rxjs": "~7.8.0",
         "tslib": "^2.3.0",
         "zone.js": "~0.15.0"
@@ -6448,6 +6449,19 @@
         "yallist": "^3.0.2"
       }
     },
+    "node_modules/lucide-angular": {
+      "version": "0.545.0",
+      "resolved": "https://registry.npmjs.org/lucide-angular/-/lucide-angular-0.545.0.tgz",
+      "integrity": "sha512-uXAM660zZQftFn+co0OFD91GwLTuEYk1/qUaoRbI9rlttvF/m6KHYbESlJSdWXTWYUEkyhzeTvn0dVi9MomuNA==",
+      "license": "ISC",
+      "dependencies": {
+        "tslib": "^2.3.0"
+      },
+      "peerDependencies": {
+        "@angular/common": "13.x - 20.x",
+        "@angular/core": "13.x - 20.x"
+      }
+    },
     "node_modules/magic-string": {
       "version": "0.30.17",
       "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.17.tgz",