Add Prompt Builder page for multi-scene prompt sequences.

Name, save, and load ordered scenes on the server; assemble copyable text with a Batch-compatible double blank line between scenes.

utils/promptSequences.ts

@@ -0,0 +1,96 @@
+export type PromptSequenceCharacter = {
+  id: string
+  name: string
+  description: string
+}
+
+export type PromptSequenceScene = {
+  id: string
+  title: string
+  style: string
+  settings: string
+  characters: PromptSequenceCharacter[]
+  prompt: string
+}
+
+export type PromptSequence = {
+  id: string
+  name: string
+  scenes: PromptSequenceScene[]
+  createdAt: number
+  updatedAt: number
+}
+
+export const PROMPT_SEQUENCE_NAME_MAX = 80
+export const PROMPT_SEQUENCE_FIELD_MAX = 50_000
+export const PROMPT_SEQUENCE_TITLE_MAX = 60
+
+export {
+  newId,
+  emptyCharacter,
+  emptyScene,
+  cloneSceneForNext,
+  formatCharacterLine,
+  assembleSceneText,
+  assembleSequenceText
+} from '../shared/prompt-sequences.mjs'
+
+import {
+  newId,
+  emptyCharacter,
+  emptyScene
+} from '../shared/prompt-sequences.mjs'
+
+export function normalizePromptSequenceName(raw: unknown) {
+  return String(raw || '').trim().replace(/\s+/g, ' ').slice(0, PROMPT_SEQUENCE_NAME_MAX)
+}
+
+export function normalizePromptSequenceField(raw: unknown) {
+  return String(raw || '').replace(/\r\n/g, '\n').slice(0, PROMPT_SEQUENCE_FIELD_MAX)
+}
+
+export function normalizePromptSequenceTitle(raw: unknown, fallback: string) {
+  const title = String(raw || '').trim().replace(/\s+/g, ' ').slice(0, PROMPT_SEQUENCE_TITLE_MAX)
+  return title || fallback
+}
+
+export function normalizeCharacter(raw: unknown): PromptSequenceCharacter {
+  const rec = (raw && typeof raw === 'object' ? raw : {}) as Record<string, unknown>
+  return {
+    id: String(rec.id || '').trim() || newId(),
+    name: String(rec.name || '').trim().slice(0, 120),
+    description: normalizePromptSequenceField(rec.description).trim()
+  }
+}
+
+export function normalizeScene(raw: unknown, index: number): PromptSequenceScene {
+  const rec = (raw && typeof raw === 'object' ? raw : {}) as Record<string, unknown>
+  const characters = Array.isArray(rec.characters)
+    ? rec.characters.map(normalizeCharacter)
+    : [emptyCharacter()]
+  return {
+    id: String(rec.id || '').trim() || newId(),
+    title: normalizePromptSequenceTitle(rec.title, `Scene ${index + 1}`),
+    style: normalizePromptSequenceField(rec.style),
+    settings: normalizePromptSequenceField(rec.settings),
+    characters: characters.length ? characters : [emptyCharacter()],
+    prompt: normalizePromptSequenceField(rec.prompt)
+  }
+}
+
+export function normalizePromptSequence(raw: unknown): PromptSequence | null {
+  if (!raw || typeof raw !== 'object') return null
+  const rec = raw as Record<string, unknown>
+  const name = normalizePromptSequenceName(rec.name)
+  if (!name) return null
+  const scenesRaw = Array.isArray(rec.scenes) ? rec.scenes : []
+  const scenes = scenesRaw.map((scene, index) => normalizeScene(scene, index))
+  const createdAt = Number(rec.createdAt) || Date.now()
+  return {
+    id: String(rec.id || '').trim() || newId(),
+    name,
+    scenes: scenes.length ? scenes : [emptyScene(1)],
+    createdAt,
+    updatedAt: Number(rec.updatedAt) || createdAt
+  }
+}