feat: persistent recent files history + fix limit enforcement + fix settings data loss

- Recent files are now persisted to disk and survive restarts
- Max items limit is applied on load (in case setting was reduced)
- Omitted paths regex filtering is now wired up in addToRecentFiles
- Fixed saveAndRefresh() overwriting entire plugin data on settings change
- Debounced disk writes (300ms) to avoid excessive saves on rapid opens

src/views/waypoint-view.ts

@@ -304,7 +304,7 @@ export class WaypointView extends ItemView {
 			removeBtn.addEventListener('click', (e) => {
 				e.stopPropagation();
 				this.plugin.recentFiles = this.plugin.recentFiles.filter(f => f.path !== file.path);
-				this.plugin.saveSettings();
+				this.plugin.persistRecentFiles();
 				this.redraw();
 			});
 			setTooltip(navFile, file.path);
@@ -384,7 +384,7 @@ export class WaypointView extends ItemView {
 		} else {
 			new Notice('Cannot find file');
 			this.plugin.recentFiles = this.plugin.recentFiles.filter(f => f.path !== file.path);
-			this.plugin.saveSettings();
+			this.plugin.persistRecentFiles();
 			this.redraw();
 		}
 	}