refactor(character-dictionary): extract applyCharacterDictionarySelection helper

- Add `applyCharacterDictionarySelection` in its own module with injected deps
- Catches sync errors and emits a warning instead of propagating
- Remove duplicated inline logic from IPC and CLI startup handlers in main.ts
- Add unit test covering sync-failure resilience

src/main.ts

@@ -534,6 +534,7 @@ import {
   resolveSubtitleSourcePath,
 } from './main/runtime/subtitle-prefetch-source';
 import { createSubtitlePrefetchInitController } from './main/runtime/subtitle-prefetch-init';
+import { applyCharacterDictionarySelection } from './main/character-dictionary-selection';
 import { codecToExtension, getSubsyncConfig } from './subsync/utils';
 
 if (process.platform === 'linux') {
@@ -4861,12 +4862,16 @@ const { registerIpcRuntimeHandlers } = composeIpcRuntimeHandlers({
       retryAnilistQueueNow: () => processNextAnilistRetryUpdate(),
       getCharacterDictionarySelection: () =>
         characterDictionaryRuntime.getManualSelectionSnapshot(),
-      setCharacterDictionarySelection: async (mediaId: number) => {
-        const result = await characterDictionaryRuntime.setManualSelection({ mediaId });
-        resetAnilistMediaGuessState();
-        await characterDictionaryAutoSyncRuntime.runSyncNow();
-        return result;
-      },
+      setCharacterDictionarySelection: async (mediaId: number) =>
+        applyCharacterDictionarySelection(
+          { mediaId },
+          {
+            setManualSelection: (request) => characterDictionaryRuntime.setManualSelection(request),
+            resetAnilistMediaGuessState,
+            runSyncNow: () => characterDictionaryAutoSyncRuntime.runSyncNow(),
+            warn: (message, error) => logger.warn(message, error),
+          },
+        ),
       appendClipboardVideoToQueue: () => appendClipboardVideoToQueue(),
       ...playlistBrowserMainDeps,
       getImmersionTracker: () => appState.immersionTracker,
@@ -4951,12 +4956,14 @@ const { handleCliCommand, handleInitialArgs } = composeCliStartupHandlers({
     },
     getCharacterDictionarySelection: async (targetPath?: string) =>
       characterDictionaryRuntime.getManualSelectionSnapshot(targetPath),
-    setCharacterDictionarySelection: async (request) => {
-      const result = await characterDictionaryRuntime.setManualSelection(request);
-      resetAnilistMediaGuessState();
-      await characterDictionaryAutoSyncRuntime.runSyncNow();
-      return result;
-    },
+    setCharacterDictionarySelection: async (request) =>
+      applyCharacterDictionarySelection(request, {
+        setManualSelection: (selectionRequest) =>
+          characterDictionaryRuntime.setManualSelection(selectionRequest),
+        resetAnilistMediaGuessState,
+        runSyncNow: () => characterDictionaryAutoSyncRuntime.runSyncNow(),
+        warn: (message, error) => logger.warn(message, error),
+      }),
     runJellyfinCommand: (argsFromCommand: CliArgs) => runJellyfinCommand(argsFromCommand),
     runStatsCommand: (argsFromCommand: CliArgs, source: CliCommandSource) =>
       runStatsCliCommand(argsFromCommand, source),

src/main/character-dictionary-selection.test.ts

@@ -0,0 +1,27 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import { applyCharacterDictionarySelection } from './character-dictionary-selection';
+
+test('applyCharacterDictionarySelection returns saved override when post-save sync fails', async () => {
+  const warnings: unknown[] = [];
+  const result = await applyCharacterDictionarySelection(
+    { mediaId: 21355 },
+    {
+      setManualSelection: async (request) => ({
+        ok: true,
+        seriesKey: `series-${request.mediaId}`,
+        selected: { id: request.mediaId, title: 'Re:ZERO', episodes: 25 },
+        staleMediaIds: [10607],
+      }),
+      resetAnilistMediaGuessState: () => {},
+      runSyncNow: async () => {
+        throw new Error('sync failed');
+      },
+      warn: (...args) => warnings.push(args),
+    },
+  );
+
+  assert.equal(result.selected.id, 21355);
+  assert.equal(warnings.length, 1);
+});

src/main/character-dictionary-selection.ts

@@ -0,0 +1,29 @@
+import type { CharacterDictionaryManualSelectionResult } from './character-dictionary-runtime/types';
+
+export type CharacterDictionarySelectionRequest = {
+  targetPath?: string;
+  mediaId: number;
+};
+
+export type CharacterDictionarySelectionDeps = {
+  setManualSelection: (
+    request: CharacterDictionarySelectionRequest,
+  ) => Promise<CharacterDictionaryManualSelectionResult>;
+  resetAnilistMediaGuessState: () => void;
+  runSyncNow: () => Promise<void>;
+  warn: (message: string, error?: unknown) => void;
+};
+
+export async function applyCharacterDictionarySelection(
+  request: CharacterDictionarySelectionRequest,
+  deps: CharacterDictionarySelectionDeps,
+): Promise<CharacterDictionaryManualSelectionResult> {
+  const result = await deps.setManualSelection(request);
+  deps.resetAnilistMediaGuessState();
+  try {
+    await deps.runSyncNow();
+  } catch (error) {
+    deps.warn('Character dictionary auto-sync failed after manual selection', error);
+  }
+  return result;
+}