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/app/components/upload-form/upload-form.ts

@@ -2,11 +2,12 @@ import { Component } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { ReactiveFormsModule, FormBuilder, FormGroup, Validators } from '@angular/forms';
 import { ArtifactService } from '../../services/artifact';
+import { LucideAngularModule, Upload } from 'lucide-angular';
 
 @Component({
   selector: 'app-upload-form',
   standalone: true,
-  imports: [CommonModule, ReactiveFormsModule],
+  imports: [CommonModule, ReactiveFormsModule, LucideAngularModule],
   templateUrl: './upload-form.html',
   styleUrls: ['./upload-form.css']
 })
@@ -15,6 +16,7 @@ export class UploadFormComponent {
   selectedFile: File | null = null;
   uploading: boolean = false;
   uploadStatus: { message: string, success: boolean } | null = null;
+  readonly Upload = Upload;
 
   constructor(
     private fb: FormBuilder,