feat(anki): support Senren scene-switching field grouping

- Add Senren configuration, duplicate merging, and scene-aligned media fields
- Document Senren setup and enforce Kiku/Senren exclusivity

src/config/resolve/anki-connect/senren.ts

@@ -0,0 +1,34 @@
+import { DEFAULT_CONFIG } from '../../definitions';
+import type { ResolveContext } from '../context';
+
+export function applyAnkiSenrenResolution(context: ResolveContext): void {
+  if (
+    context.resolved.ankiConnect.isSenren.fieldGrouping !== 'auto' &&
+    context.resolved.ankiConnect.isSenren.fieldGrouping !== 'manual' &&
+    context.resolved.ankiConnect.isSenren.fieldGrouping !== 'disabled'
+  ) {
+    context.warn(
+      'ankiConnect.isSenren.fieldGrouping',
+      context.resolved.ankiConnect.isSenren.fieldGrouping,
+      DEFAULT_CONFIG.ankiConnect.isSenren.fieldGrouping,
+      'Expected auto, manual, or disabled.',
+    );
+    context.resolved.ankiConnect.isSenren.fieldGrouping =
+      DEFAULT_CONFIG.ankiConnect.isSenren.fieldGrouping;
+  }
+
+  // Kiku and Senren field grouping write incompatible markup into the same note
+  // fields, so only one may be active; Kiku wins to preserve pre-existing setups.
+  if (
+    context.resolved.ankiConnect.isSenren.enabled === true &&
+    context.resolved.ankiConnect.isKiku.enabled === true
+  ) {
+    context.warn(
+      'ankiConnect.isSenren.enabled',
+      true,
+      false,
+      'Kiku and Senren are mutually exclusive; disable isKiku.enabled to use Senren field grouping.',
+    );
+    context.resolved.ankiConnect.isSenren.enabled = false;
+  }
+}