feat: enhance waveform editor with playback controls and segment interaction

- Added onPlayFromCursor and playbackCursorMs props to WaveformEditorCanvas for playback control.
- Implemented visual feedback for segment selection and hover states, including color adjustments and labels.
- Introduced smooth cursor animation for better user experience during interaction.
- Enhanced segment metadata handling in types and IPC for better integration with the library.
- Added focusOnFile method in LibraryStore to manage file selection and refresh.
- Updated styles for edit mode, including new classes for waveform and playback controls.
- Introduced new IPC channel for splitting audio files and updated related interfaces.
- Added parentFileId to AudioFileSummary for tracking source files.
- Implemented tests for tagging service to ensure metadata integrity and tag preservation.
- Created scrubWorklet and assets type definitions for future audio processing features.

src/preload/index.ts

@@ -6,6 +6,7 @@ import type {
   AudioFileSummary,
   CategoryRecord,
   LibraryScanSummary,
+  SplitSegmentRequest,
   TagUpdatePayload
 } from '../shared/models';
 
@@ -37,7 +38,10 @@ const api: RendererApi = {
   async moveFile(fileId: number, targetRelativeDirectory: string): Promise<AudioFileSummary> {
     return ipcRenderer.invoke(IPC_CHANNELS.libraryMove, fileId, targetRelativeDirectory);
   },
-  async organizeFile(fileId: number, metadata: { customName?: string; author?: string; copyright?: string; rating?: number }): Promise<AudioFileSummary> {
+  async organizeFile(
+    fileId: number,
+    metadata: { customName?: string | null; author?: string | null; copyright?: string | null; rating?: number }
+  ): Promise<AudioFileSummary> {
     return ipcRenderer.invoke(IPC_CHANNELS.libraryOrganize, fileId, metadata);
   },
   async updateCustomName(fileId: number, customName: string | null): Promise<AudioFileSummary> {
@@ -49,6 +53,9 @@ const api: RendererApi = {
   async deleteFiles(fileIds: number[]): Promise<void> {
     return ipcRenderer.invoke(IPC_CHANNELS.libraryDelete, fileIds);
   },
+  async splitFile(fileId: number, segments: SplitSegmentRequest[]): Promise<AudioFileSummary[]> {
+    return ipcRenderer.invoke(IPC_CHANNELS.librarySplit, fileId, segments);
+  },
   async getAudioBuffer(fileId: number): Promise<AudioBufferPayload> {
     return ipcRenderer.invoke(IPC_CHANNELS.libraryBuffer, fileId);
   },
@@ -70,7 +77,10 @@ const api: RendererApi = {
   async listMetadataSuggestions(): Promise<{ authors: string[]; copyrights: string[] }> {
     return ipcRenderer.invoke(IPC_CHANNELS.libraryMetadataSuggestions);
   },
-  async updateFileMetadata(fileId: number, metadata: { author?: string; copyright?: string; rating?: number }): Promise<void> {
+  async updateFileMetadata(
+    fileId: number,
+    metadata: { author?: string | null; copyright?: string | null; rating?: number }
+  ): Promise<void> {
     return ipcRenderer.invoke(IPC_CHANNELS.libraryUpdateMetadata, fileId, metadata);
   },
   onMenuAction(channel: string, callback: () => void): () => void {