fractal_zoomer: single Mandelbrot mode with continuous auto-zoom and subtle center drift

[smcga]

Motivation

• Simplify the effect and improve the visual zoom behavior by removing multiple fractal types and making the zoomer animate itself over time.
• Keep the effect useful for timeline automation while making it visually alive even when zoom isn't being changed interactively.

Description

• Removed setType branching and Julia/BurningShip code paths so fractal_zoomer renders a single Mandelbrot-style fractal (src/renderer/effects/fractalZoomer.ts).
• Added time-driven automatic zoom (autoZoom) and subtle center drift (centerX/centerY offsets) in buildFractalZoomerState so the effect continuously zooms and moves even without manual zoom edits.
• Updated the debug manifest controls and docs (src/renderer/effects/manifest/fractal_zoomer.manifest.ts, README.md) to remove the setType selector and describe the new built-in zoom motion, and regenerated docs/effects.md.
• Added a unit test to assert automatic zoom/center animation and adjusted existing tests to match the simplified parameter set (src/renderer/effects/fractalZoomer.test.ts).

Testing

• Ran npm run docs:effects and regenerated docs/effects.md successfully.
• Ran npm run docs:check and the effects/transitions docs tests passed.
• Ran npm run test -- src/renderer/effects/fractalZoomer.test.ts and the fractal zoomer tests passed.
• Ran the full npm test suite and all tests passed (all updated tests included succeeded).

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
codexperimental	Ready	Preview, Comment	Apr 5, 2026 6:44pm