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Deferred: enhancements and nice-to-haves

Smaller, mostly independent improvements. None are blocking; ordered roughly by value.

Add a history stack around the reducer (past, present, future) with Cmd/Ctrl+Z and Shift+Cmd/Ctrl+Z.
The catch: continuous actions (setCrop, setZoom, setRotation from the slider) fire many times. Coalesce them - snapshot history only on discrete commits (template, aspect, rotateBy, flip, effect preset, format, quality) and treat a drag as a single entry (push on interaction start, replace until it settles).
Medium effort; the coalescing is the only subtle part.

Save format, quality, maxEdge, and last template to localStorage; restore on load. Do not persist the image.
Guard for SSR/StrictMode (read in an effect, not during render).
Small effort.

The brief mentions a "favicon set". Export several sizes at once (16, 32, 48, 180, 192, 512) as a zip.
Add a tiny zip writer (for example fflate) in the worker; or trigger multiple downloads (some browsers throttle multiple downloads, so zip is nicer).
Small-to-medium effort.

Exposure, temperature/tint (white balance), sharpen, vignette, levels/curves.
CSS/canvas filter cannot do these well. Two options:
- Implement them with wasm-vips operations in the worker (vips has sharpen, linear, recomb, etc.), or
- Write small WebGL/Canvas shaders for live preview plus a matching worker pass.
The live-preview-must-match-export rule makes this non-trivial; vips-only (export-time) is simpler but loses live preview for those controls.
Medium-to-large effort.

Beyond the current "limit long edge" cap, allow typing an exact width/height for custom crops (with an aspect lock to avoid stretching). The worker already accepts an output size; this is mostly UI.
Small effort.

Let users create, edit, reorder, and persist their own templates (localStorage or export/import JSON). Templates are already plain data, so the model fits.
Medium effort.

Show an estimated output file size before export. Requires a debounced encode of a downscaled proxy (full encode per keystroke is too expensive).
Medium effort; easy to get wrong on cost.

The app was verified with Playwright, but no suite is committed because the browser binary path is environment-specific (launch used an explicit executablePath). To commit a suite: add @playwright/test as a dev dependency, add a config that resolves the browser normally (npx playwright install), and port the scenarios from VERIFICATION.md. Wire a "test:e2e" script.
Small-to-medium effort.

The responsive drawers work, but could add an explicit close button inside each drawer and swipe-to-dismiss. Small effort.