Add read-only external Yomitan profile support

- add `yomitan.externalProfilePath` config and default/template wiring
- load Yomitan from an external Electron profile/session when configured
- disable SubMiner Yomitan writes/settings UI in external-profile mode and update docs/tests

src/config/resolve/integrations.ts

@@ -199,6 +199,22 @@ export function applyIntegrationConfig(context: ResolveContext): void {
     }
   }
 
+  if (isObject(src.yomitan)) {
+    const externalProfilePath = asString(src.yomitan.externalProfilePath);
+    if (externalProfilePath !== undefined) {
+      resolved.yomitan.externalProfilePath = externalProfilePath.trim();
+    } else if (src.yomitan.externalProfilePath !== undefined) {
+      warn(
+        'yomitan.externalProfilePath',
+        src.yomitan.externalProfilePath,
+        resolved.yomitan.externalProfilePath,
+        'Expected string.',
+      );
+    }
+  } else if (src.yomitan !== undefined) {
+    warn('yomitan', src.yomitan, resolved.yomitan, 'Expected object.');
+  }
+
   if (isObject(src.jellyfin)) {
     const enabled = asBoolean(src.jellyfin.enabled);
     if (enabled !== undefined) {

src/config/resolve/jellyfin.test.ts

@@ -104,3 +104,26 @@ test('anilist character dictionary fields are parsed, clamped, and enum-validate
     warnedPaths.includes('anilist.characterDictionary.collapsibleSections.characterInformation'),
   );
 });
+
+test('yomitan externalProfilePath is trimmed and invalid values warn', () => {
+  const { context, warnings } = createResolveContext({
+    yomitan: {
+      externalProfilePath: '  /tmp/gsm-profile  ',
+    },
+  });
+
+  applyIntegrationConfig(context);
+
+  assert.equal(context.resolved.yomitan.externalProfilePath, '/tmp/gsm-profile');
+
+  const invalid = createResolveContext({
+    yomitan: {
+      externalProfilePath: 42 as never,
+    },
+  });
+
+  applyIntegrationConfig(invalid.context);
+
+  assert.equal(invalid.context.resolved.yomitan.externalProfilePath, '');
+  assert.ok(invalid.warnings.some((warning) => warning.path === 'yomitan.externalProfilePath'));
+});