tests: add Playwright E2E fuzz test for the guided lesson - #627
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Simulates a human typing through the full American English alphabet in the guided lesson with a randomized per-round typing speed, checking that keys never regress, unlock one at a time, and that the target key, its toast, and its confidence state stay consistent throughout. Others included tests cover the toasts, the on-screen keyboard's hesitation-pointer highlighting the physically correct key, and a mistyped-then-corrected character rendering in the theme's miss color.
Writes new guided-lesson settings to `localStorage` and reloads mid-run. This checks progress survives the `GuidedLesson`/`Progress` reconstruction: * `naturalWords` and a target-speed ramp shouldn't lose already-earned unlocks * `alphabetSize` can force-include several keys in one round * `recoverKeys` can legitimately re-lock a key past the guaranteed first 6.
Occasionally mistypes-then-corrects the displayed character instead of typing it cleanly, mirroring a human fumble.
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This branch adds an end-to-end test suite with Playwright which exercises the guided lessons functionality.
Completes in about <5 minutes on my machine. I run this with: