feat: Puente Mayúscula-Minúscula + TTS SpeechSynthesis + E2E fixes

lib/pedagogia/errorless.ts

@@ -0,0 +1,63 @@
+export type PromptLevel = 0 | 1 | 2 | 3 | 4
+
+// Galperin stages mapped to prompt levels
+export const GALPERIN_STAGES = {
+  HAND: 0,           // Concrete: full model, show the answer
+  EXTERNAL_SPEECH: 1, // Prompts the child to say out loud
+  INNER_SPEECH: 2,   // Partial prompt, whisper
+  MENTAL: 3,         // Verbal cue only
+  MASTERED: 4,       // No prompt
+} as const
+
+export interface PromptState {
+  level: PromptLevel
+  consecutiveCorrect: number
+  consecutiveIncorrect: number
+}
+
+export function getInitialState(): PromptState {
+  return {
+    level: 0,
+    consecutiveCorrect: 0,
+    consecutiveIncorrect: 0,
+  }
+}
+
+export function evaluateResponse(
+  state: PromptState,
+  correct: boolean,
+  masterThreshold: number = 3,
+  regressThreshold: number = 2,
+): PromptState {
+  if (correct) {
+    const newCorrect = state.consecutiveCorrect + 1
+    const newLevel =
+      newCorrect >= masterThreshold
+        ? (Math.min(state.level + 1, 4) as PromptLevel)
+        : state.level
+    return {
+      level: newLevel,
+      consecutiveCorrect: newCorrect,
+      consecutiveIncorrect: 0,
+    }
+  }
+
+  const newIncorrect = state.consecutiveIncorrect + 1
+  const newLevel =
+    newIncorrect >= regressThreshold
+      ? (Math.max(state.level - 1, 0) as PromptLevel)
+      : state.level
+  return {
+    level: newLevel,
+    consecutiveCorrect: 0,
+    consecutiveIncorrect: newIncorrect,
+  }
+}
+
+export function shouldShowPrompt(level: PromptLevel): boolean {
+  return level < 3
+}
+
+export function isMastered(level: PromptLevel): boolean {
+  return level >= 4
+}