Phase 5: Photo Pre-Editor (Filerobot)

- Added react-filerobot-image-editor dependency
- PhotoPreEditor component with full editing capabilities
- Crop, filters, adjustments, annotations, watermark tabs
- Opens after image upload, before adding to canvas
- Exports edited image as PNG for canvas use

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/src/index.css

@@ -538,6 +538,28 @@ input, textarea, select {
   animation: spin 1s linear infinite;
 }
 
+/* Filerobot Editor Overlay */
+.filerobot-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: rgba(0, 0, 0, 0.8);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+}
+
+.filerobot-container {
+  width: 90%;
+  height: 90%;
+  background: #1e1e1e;
+  border-radius: var(--radius-lg);
+  overflow: hidden;
+}
+
 /* Responsive */
 @media (max-width: 900px) {
   .app-layout {