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test(webui): unblock svelte 5 component testing in vitest (#355)

- vitest.config.ts: add svelteTesting() plugin from @testing-library/svelte/vite
  to register the 'browser' resolve condition for the test transform; without
  it vitest loads svelte's ssr bundle in jsdom and mount() throws
  lifecycle_function_unavailable. set environmentOptions.jsdom.url to give
  the document a non-opaque origin
- vitest.config.ts: remove src/components/**/*.svelte and src/pages/**/*.svelte
  from coverage.exclude — components are now testable
- test-setup.ts: shim localStorage/sessionStorage when the runtime version
  is unusable. Node 25+ enables a stub Web Storage API that masks jsdom's
  storage and throws on access (vitest-dev/vitest#8757). The fix flag
  --no-webstorage / --localstorage-file is CLI-only, not allowed in
  NODE_OPTIONS, so a setup-file shim is the only portable option.
- ConfirmDialog.test.ts: un-skip all 6 component tests; rewrite the two
  'closes dialog' tests to actually assert the dialog hides (the prior
  asserts were no-ops); rename test titles from 'Confirm' to avoid
  collision with the confirm button's accessible name

references:
- sveltejs/svelte#11394 (mount on server)
- vitest-dev/vitest#8633 (svelte ssr in jsdom)
- vitest-dev/vitest#8757 (node 25 web storage)

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

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