Live dialogue preview in the editors (reuses the real DialoguePlayer)

- DialoguePlayer gains an `inline` mode (fills its container, no window key
  capture) and a `startId` to jump the walk to a given utterance.
- New DialoguePreview: a scaled-down mini player that fetches the resolved tree
  from GET /api/admin/story-nodes/:id/dialogue (same resolver as playback).
- Mystery graph: preview appears next to a selected dialogue node.
- Utterance editor: docked preview that jumps to the clicked/selected utterance
  and refreshes after each edit.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/index.ts

@@ -289,6 +289,10 @@ app.post('/api/admin/mysteries/:id/graph', requireAdmin, async (req, res, next)
 app.get('/api/admin/story-nodes/:id/utterances', requireAdmin, async (req, res, next) => {
   try { res.json(await storyGraph.listUtterances(String(req.params.id))) } catch (error) { next(error) }
 })
+// Resolved runtime dialogue tree for the editor's live preview (same resolver as play).
+app.get('/api/admin/story-nodes/:id/dialogue', requireAdmin, async (req, res, next) => {
+  try { res.json(await narrative.resolveDialogue(String(req.params.id))) } catch (error) { next(error) }
+})
 app.post('/api/admin/story-nodes/:id/utterances', requireAdmin, async (req, res, next) => {
   try {
     if (!requireEditing(res)) return

server/narrativeRepository.ts

@@ -43,6 +43,7 @@ export function resolvePoseAssetId(
 
 export interface NarrativeRepository {
   authorMystery(input: MysteryAuthoring): Promise<{ slug: string }>
+  resolveDialogue(nodeId: string): Promise<{ utterances: RuntimeUtterance[]; rootId: string | null }>
   createPlaythrough(userId: string, mysterySlug?: string): Promise<PlaythroughState | null>
   getCurrentPlaythrough(userId: string): Promise<PlaythroughState | null>
   advancePlaythrough(userId: string, playthroughId: string, terminalKey?: string): Promise<{ ok: boolean; state?: PlaythroughState; error?: string }>
@@ -197,6 +198,8 @@ export function createNarrativeRepository(pool: Pool, objectStorage: ObjectStora
       return { slug: input.slug }
     },
 
+    resolveDialogue(nodeId) { return resolveDialogueGraph(nodeId) },
+
     async createPlaythrough(userId, mysterySlug) {
       const client = await pool.connect()
       let playthroughId: string