Field of View: address PR review feedback

[Copilot]

Applies all actionable feedback from the Field of View game PR review. Image compression is excluded (handled separately).

Bug fixes

• stop() no longer calls saveProgress() when trialsCompleted === 0, preventing phantom session increments and stale lastPlayed timestamps on idle stops
• initGame() replaces the === 3 literal with Number.isFinite + Math.round + Math.max(1, …) validation for downAfterSuccesses, and applies clamp()-based validation to stepUpMs/stepDownMs

Module split (index.js 831 → ~593 lines)

Extracted three focused modules from the monolithic controller:

• audio.js — shared AudioContext lifecycle; getAudioContext() creates once, playFeedbackSound() resumes a suspended context instead of constructing a new AudioContext per trial
• render.js — pure rendering utilities (percent, formatMs, labelForIcon, createStimulusImage, buildTrendPolylinePoints, stat/chart/selection helpers)
• progress.js — IPC-based progress persistence

Accessibility & correctness

• Grid cell buttons now carry aria-label="Row N, column M" for screen reader targeting
• manifest.json description updated to match actual assets (kittens/toys, not shapes/stars)
• app/index.html <title> aligned with visible heading: Brain Speed Exercises
• interface.html kitten response images get loading="lazy" decoding="async"
• The kitten response buttons remain visible throughout gameplay to prevent layout shifts; they are only hidden when resetting to the instructions screen

Test coverage

Added audio.test.js, render.test.js, and progress.test.js for the new modules; gameCard.test.js import moved to file top with loose it() calls consolidated into the describe block; index.test.js mocks audio.js and progress.js to isolate the controller.

---

⌨️ Start Copilot coding agent tasks without leaving your editor — available in VS Code, Visual Studio, JetBrains IDEs and Eclipse.

[acrosman]

@copilot The adjustment made to hide the kitten buttons is wrong. You were instructed to ignore that feedback because it causes the game play area to move when the buttons appear and disappear. Revert this behavior so the buttons always show. The game play area should not move unless the window is being resized.

[Copilot]

@copilot The adjustment made to hide the kitten buttons is wrong. You were instructed to ignore that feedback because it causes the game play area to move when the buttons appear and disappear. Rever...

Fixed in commit c97d669. The kitten response buttons (#fov-response) are now shown once when gameplay starts and remain visible throughout the entire session — they're only hidden again when the game resets to the instructions screen. The per-trial hide/show logic has been removed from runStimulusPhase(), enterResponsePhase(), and submitResponse().