fix(frontend): reposition search indicator into toolbar and fix album cover art lookup

Move search indicator from absolute-positioned overlay into sort toolbar
(or dedicated search-bar-row for artists/genres views). Shows indicator
on empty-state screens. Fix cover art not displaying for expanded album
tracks by checking expandedAlbumId before the albumName guard. Add
ScanWarning model bindings.

frontend/wailsjs/go/models.ts

@@ -66,6 +66,22 @@ export namespace library {
 	
 	    }
 	}
+	export class ScanWarning {
+	    filePath: string;
+	    phase: string;
+	    err: any;
+	
+	    static createFrom(source: any = {}) {
+	        return new ScanWarning(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.filePath = source["filePath"];
+	        this.phase = source["phase"];
+	        this.err = source["err"];
+	    }
+	}
 	export class ScanMetrics {
 	    total: number;
 	    loadExisting: number;
@@ -92,6 +108,7 @@ export namespace library {
 	    updated: number;
 	    skipped: number;
 	    removed: number;
+	    warnings: ScanWarning[];
 	
 	    static createFrom(source: any = {}) {
 	        return new ScanMetrics(source);
@@ -124,8 +141,28 @@ export namespace library {
 	        this.updated = source["updated"];
 	        this.skipped = source["skipped"];
 	        this.removed = source["removed"];
+	        this.warnings = this.convertValues(source["warnings"], ScanWarning);
 	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
 	}
+	
 	export class Track {
 	    TrackName: string;
 	    ArtistName: string;