feat(election): committee management module with image upload, zoom viewer, and member profiles

- Add Committee Board component: create/edit committees with profile image upload
- Image viewer: redesigned zoom dialog with frosted glass toolbar, SVG icons, dark theme
- Committee profile image: circular upload ring, full-size zoom via ImagePreviewDialogComponent
- Member photos: clickable avatars open zoom viewer in both stacked and list views
- Backend: committee API service methods (CRUD, members, dissolve, current directors)
- Route and navigation link added to election dashboard

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

src/main.scss

@@ -49,12 +49,21 @@
 // ===== Image Preview Dialog (election candidate photo/symbol viewer) =====
 .ipd-dialog .mat-mdc-dialog-container {
   padding: 0;
-  border-radius: 10px;
+  border-radius: 20px;
   overflow: hidden;
+  background: transparent;
+  box-shadow: none;
+}
+
+.ipd-dialog .mdc-dialog__surface {
+  border-radius: 20px !important;
+  background: transparent !important;
+  box-shadow: none !important;
 }
 
 .ipd-backdrop {
-  background: rgb(0 0 0 / 75%);
+  background: rgb(0 0 0 / 82%);
+  backdrop-filter: blur(6px);
 }
 
 // ===== Sub-menu Mega Panels (rendered in CDK overlay) =====