Add welcome guide onboarding flow for first-time users #244

Job	Run time
ts-check	2m 58s
rust-check	2m 48s
rust-test (windows-latest, x86_64-pc-windows-msvc)	7m 43s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	5m 52s
rust-test (macos-latest, aarch64-apple-darwin)	5m 26s
coverage-report	11s
build	13m 18s
e2e-web	1h 54m 38s
e2e-desktop / e2e-desktop (windows-latest)	35m 59s
e2e-desktop / e2e-desktop (ubuntu-latest)	37m 29s
test-report	12s
e2e-desktop / e2e-report	7s
	3h 46m 41s

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