feat(12-02): replace config-page library section with full library management UI

- Add library list with name, path, track count per library
- Add Library button opens folder picker, auto-creates library
- Inline rename with Enter/Escape via overflow menu
- Removal confirmation dialog with real impact counts (tracks, playlists, queue)
- Toast notification with removal summary after library removal
- Add GetAllLibrariesWithTrackCounts + Info type to backend Library struct
- Add Wails binding stubs for AddLibrary, RenameLibrary, RemoveLibrary, GetRemovalImpact
- Add Info, RemovalImpact, RemovalSummary types to models.ts
- Remove old single-directory library config UI (GetLibraryDirectory/SetLibraryDirectory)

frontend/wailsjs/go/library/Library.d.ts

@@ -3,6 +3,8 @@
 import {library} from '../models';
 import {context} from '../models';
 
+export function AddLibrary(arg1:string):Promise<library.Info>;
+
 export function CancelAllScans():Promise<void>;
 
 export function CancelCurrentScan():Promise<void>;
@@ -13,6 +15,8 @@ export function FullRescan():Promise<library.ScanMetrics>;
 
 export function GetAlbumTracks(arg1:number):Promise<Array<library.Track>>;
 
+export function GetAllLibrariesWithTrackCounts():Promise<Array<library.Info>>;
+
 export function GetAlbumsByArtist(arg1:number):Promise<Array<library.Album>>;
 
 export function GetAllAlbums():Promise<Array<library.Album>>;
@@ -23,6 +27,8 @@ export function GetAllGenresWithCounts():Promise<Array<library.GenreWithCount>>;
 
 export function GetAllTracks():Promise<Array<library.Track>>;
 
+export function GetRemovalImpact(arg1:number):Promise<library.RemovalImpact>;
+
 export function GetScanQueueLength():Promise<number>;
 
 export function GetTracksByGenre(arg1:string):Promise<Array<library.Track>>;
@@ -33,6 +39,10 @@ export function IsScanPaused():Promise<boolean>;
 
 export function PauseScan():Promise<void>;
 
+export function RemoveLibrary(arg1:number):Promise<library.RemovalSummary>;
+
+export function RenameLibrary(arg1:number, arg2:string):Promise<void>;
+
 export function QueuedLibraryNames():Promise<Array<string>>;
 
 export function ResumeScan():Promise<void>;

frontend/wailsjs/go/library/Library.js

@@ -2,6 +2,10 @@
 // Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
 // This file is automatically generated. DO NOT EDIT
 
+export function AddLibrary(arg1) {
+  return window['go']['library']['Library']['AddLibrary'](arg1);
+}
+
 export function CancelAllScans() {
   return window['go']['library']['Library']['CancelAllScans']();
 }
@@ -22,6 +26,10 @@ export function GetAlbumTracks(arg1) {
   return window['go']['library']['Library']['GetAlbumTracks'](arg1);
 }
 
+export function GetAllLibrariesWithTrackCounts() {
+  return window['go']['library']['Library']['GetAllLibrariesWithTrackCounts']();
+}
+
 export function GetAlbumsByArtist(arg1) {
   return window['go']['library']['Library']['GetAlbumsByArtist'](arg1);
 }
@@ -42,6 +50,10 @@ export function GetAllTracks() {
   return window['go']['library']['Library']['GetAllTracks']();
 }
 
+export function GetRemovalImpact(arg1) {
+  return window['go']['library']['Library']['GetRemovalImpact'](arg1);
+}
+
 export function GetScanQueueLength() {
   return window['go']['library']['Library']['GetScanQueueLength']();
 }
@@ -62,6 +74,14 @@ export function PauseScan() {
   return window['go']['library']['Library']['PauseScan']();
 }
 
+export function RemoveLibrary(arg1) {
+  return window['go']['library']['Library']['RemoveLibrary'](arg1);
+}
+
+export function RenameLibrary(arg1, arg2) {
+  return window['go']['library']['Library']['RenameLibrary'](arg1, arg2);
+}
+
 export function QueuedLibraryNames() {
   return window['go']['library']['Library']['QueuedLibraryNames']();
 }

frontend/wailsjs/go/models.ts

@@ -40,6 +40,62 @@ export namespace library {
 	        this.Name = source["Name"];
 	    }
 	}
+	export class Info {
+	    id: number;
+	    name: string;
+	    path: string;
+	    trackCount: number;
+	
+	    static createFrom(source: any = {}) {
+	        return new Info(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.id = source["id"];
+	        this.name = source["name"];
+	        this.path = source["path"];
+	        this.trackCount = source["trackCount"];
+	    }
+	}
+	export class RemovalImpact {
+	    trackCount: number;
+	    playlistsAffected: number;
+	    queueItemCount: number;
+	
+	    static createFrom(source: any = {}) {
+	        return new RemovalImpact(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.trackCount = source["trackCount"];
+	        this.playlistsAffected = source["playlistsAffected"];
+	        this.queueItemCount = source["queueItemCount"];
+	    }
+	}
+	export class RemovalSummary {
+	    tracksDeleted: number;
+	    artistsRemoved: number;
+	    albumsRemoved: number;
+	    genresRemoved: number;
+	    playlistsAffected: number;
+	    queueItemsRemoved: number;
+	
+	    static createFrom(source: any = {}) {
+	        return new RemovalSummary(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.tracksDeleted = source["tracksDeleted"];
+	        this.artistsRemoved = source["artistsRemoved"];
+	        this.albumsRemoved = source["albumsRemoved"];
+	        this.genresRemoved = source["genresRemoved"];
+	        this.playlistsAffected = source["playlistsAffected"];
+	        this.queueItemsRemoved = source["queueItemsRemoved"];
+	    }
+	}
 	export class GenreWithCount {
 	    Name: string;
 	    TrackCount: number;