feat(ui): add scan progress and error reporting to UI (#4094)

* feat(scanner): add LastScanError tracking to scanner status

- Introduced LastScanErrorKey constant for error tracking.
- Updated StatusInfo struct to include LastError field.
- Modified scanner logic to store and retrieve last scan error.
- Enhanced ScanStatus response to include error information.
- Updated UI components to display last scan error when applicable.
- Added tests to verify last scan error functionality.

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(scanner): enhance scan status with type and elapsed time tracking

- Added LastScanTypeKey and LastScanStartTimeKey constants for tracking scan type and start time.
- Updated StatusInfo struct to include ScanType and ElapsedTime fields.
- Implemented getScanInfo method to retrieve scan type, elapsed time, and last error.
- Modified scanner logic to store scan type and start time during scans.
- Enhanced ScanStatus response and UI components to display scan type and elapsed time.
- Added formatShortDuration utility for better elapsed time representation.
- Updated activity reducer to handle new scan status fields.

Signed-off-by: Deluan <deluan@navidrome.org>

* refactor(tests): consolidate controller status tests into a single file

- Removed the old controller_status_test.go file.
- Merged relevant tests into the new controller_test.go file for better organization and maintainability.
- Ensured all existing test cases for controller status are preserved and functional.

Signed-off-by: Deluan <deluan@navidrome.org>

* Fix formatting issues

* refactor(scanner): update getScanInfo method documentation

---------

Signed-off-by: Deluan <deluan@navidrome.org>

scanner/scanner.go

@@ -57,12 +57,21 @@ func (s *scannerImpl) scanAll(ctx context.Context, fullScan bool, progress chan<
 	startTime := time.Now()
 	log.Info(ctx, "Scanner: Starting scan", "fullScan", state.fullScan, "numLibraries", len(libs))
 
+	// Store scan type and start time
+	scanType := "quick"
+	if state.fullScan {
+		scanType = "full"
+	}
+	_ = s.ds.Property(ctx).Put(consts.LastScanTypeKey, scanType)
+	_ = s.ds.Property(ctx).Put(consts.LastScanStartTimeKey, startTime.Format(time.RFC3339))
+
 	// if there was a full scan in progress, force a full scan
 	if !state.fullScan {
 		for _, lib := range libs {
 			if lib.FullScanInProgress {
 				log.Info(ctx, "Scanner: Interrupted full scan detected", "lib", lib.Name)
 				state.fullScan = true
+				_ = s.ds.Property(ctx).Put(consts.LastScanTypeKey, "full")
 				break
 			}
 		}
@@ -100,11 +109,14 @@ func (s *scannerImpl) scanAll(ctx context.Context, fullScan bool, progress chan<
 	)
 	if err != nil {
 		log.Error(ctx, "Scanner: Finished with error", "duration", time.Since(startTime), err)
+		_ = s.ds.Property(ctx).Put(consts.LastScanErrorKey, err.Error())
 		state.sendError(err)
 		s.metrics.WriteAfterScanMetrics(ctx, false)
 		return
 	}
 
+	_ = s.ds.Property(ctx).Put(consts.LastScanErrorKey, "")
+
 	if state.changesDetected.Load() {
 		state.sendProgress(&ProgressInfo{ChangesDetected: true})
 	}