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refactor(flasher): extract state machine + serial adapter; add tests (#371)

* refactor(flasher): extract state machine, serial adapter, error categorization

- withTimeout.ts: pure timeout wrapper lifted from App.svelte
- errorMessages.ts: pure error-categorization functions with exact regex/message strings
- serial.ts: web serial + esptool-js boundary (requestPort, connectDevice, disconnectDevice, writeFirmware, hardReset)
- flashState.svelte.ts: createFlashState() factory using svelte 5 runes; all state transitions and async actions lifted from App.svelte
- App.svelte: reduced to ~140 LOC thin shell; reads state.*, delegates clicks to state actions

no behavior changes: same state transitions, same error messages, same button enablement

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* test(webui): cover flasher modules and include in coveralls upload

- vitest.config.ts: mirrors ui-kit config; VITE_FLASHER_FIXTURES=1 env
- test-setup.ts: mirrors ui-kit setup; adds navigator.serial stub
- withTimeout.test.ts: 6 specs (resolve, timeout, label, ms-to-s, rejection, no-late-fire)
- errorMessages.test.ts: 13 specs (all regex branches for connect/flash error categorization)
- release.test.ts: 6 specs (manifest 200/404/500, asset streaming, sha256 mismatch, progress)
- serial.test.ts: 11 specs (requestPort, connectDevice, disconnectDevice, writeFirmware, hardReset)
- flashState.test.ts: 25 specs (initial state, select, manifest, connect paths, flash paths, flashAnother, handleDeviceDisconnect, boardOptions)
- App.test.ts: 10 specs (idle, connecting, connected, chip info, progress, done, errors, disconnect banner)
- main.test.ts: 1 spec (mount called with #app target)

CI: adds flasher test step to webui-check; adds flasher lcov to coveralls upload

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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