refactor: update tag-related styles and UI components with new color system

src/app/features/note/components/note-header/note-header.component.html

@@ -45,5 +45,6 @@
     [noteId]="noteId"
     [tags]="tags"
     (saved)="tagsChange.emit($event)"
+    (tagSelected)="tagSelected.emit($event)"
   ></app-tag-manager>
 </header>

src/app/features/note/components/note-header/note-header.component.ts

@@ -24,6 +24,7 @@ export class NoteHeaderComponent implements AfterViewInit, OnDestroy {
   @Output() openDirectory = new EventEmitter<void>();
   @Output() copyRequested = new EventEmitter<void>();
   @Output() tagsChange = new EventEmitter<string[]>();
+  @Output() tagSelected = new EventEmitter<string>();
 
   pathParts: { prefix: string; filename: string } = { prefix: '', filename: '' };