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interval configurator backports

jedmund requested to merge jedmund/interval-configurator-backports into main

Created by: jedmund

Extends the configurator + layout polish from Interval Comparison (#29) to Interval Trainer and Interval Classifier so all three scored-interval playgrounds share the same shape.

Interval Trainer

  • New config fields: `progressiveIntervals`, `progressionThreshold`, `choiceCount` (all optional). Lesson-authored `progressiveAdditions` continues to work; playground uses `progressiveIntervals`.
  • Side panel: vertical interval checklist (full names, None header button), Progressive difficulty toggle, Choices segmented picker (2/3/4/6), Total questions stepper (6-20, step 2).
  • Per-prompt foil selection: the (N-1) semitonally-nearest intervals to the target, skipping enharmonic duplicates. Progressive unlocks more intervals, which naturally tightens foil distance.
  • `lastTargetKey` dedup: targets never repeat back-to-back.
  • Feedback now two centered lines:
    • correct: "You're right! That was a Interval" / "N semitones ranging from Note A to Note B"
    • incorrect: "That was a Interval" / "N semitones ranging from Note A to Note B"

Interval Classifier

  • Optional `totalQuestions` cap in the config; exercise shuffles and truncates.
  • Side panel: Octaves segmented picker (1/2/3), Total questions stepper (4-20), Shuffle toggle.
  • Builder transposes the 10 base C4-octave prompts up by N octaves for 2 and 3, spanning C4-C7 max. Explanations carry over (they reference pitch classes, not octaves) and now bold the note names with Unicode ♯/♭.

Shared polish (all three exercises)

  • Fixed 320pt card height with title pinned to top and Next button anchored to bottom.
  • Next button shrunk to footnote font + 6pt vertical padding.
  • Standalone JSONs for Trainer and Classifier deleted — params drive both. Lesson JSON paths untouched.
  • Side panel renders for all three interval exercises, not just Comparison. `configVersion` bumps on any param change keep the card reactive without Reset/Restart.

Test plan

  • Interval Trainer standalone: side panel shows all 15 intervals selected, Progressive off, Choices 4, Total 8. Picker renders as 2×2. Pick 6 → 2×3. Pick 2/3 → single row.
  • Trainer Progressive on: first prompt uses only easiest 3 intervals. After 3 correct total, 4th interval unlocks. No consecutive-duplicate targets.
  • Trainer feedback text matches spec (two lines, accent + secondary, no trailing period).
  • Interval Classifier standalone: side panel shows Octaves 1, Total 8, Shuffle on. Bump Octaves to 2 → prompts now include C5-based patterns. Bump to 3 → C6 patterns.
  • Classifier feedback bolds note names (e.g. "C to D♭ is one key apart").
  • Lesson paths for all three exercises unchanged (interval-classifier.json lessons, interval_trainer with progressiveAdditions, interval_comparison pairs).
  • All three cards are 320pt tall with consistent title-top / button-bottom layout.

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