Add welcome guide onboarding flow for first-time users #219

Job	Run time
ts-check	2m 55s
rust-check	2m 27s
rust-test (macos-latest, aarch64-apple-darwin)	2m 34s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	3m 4s
rust-test (windows-latest, x86_64-pc-windows-msvc)	4m 16s
build	10m 56s
coverage-report	7s
e2e-desktop / e2e-desktop (ubuntu-latest)	33m 48s
e2e-desktop / e2e-desktop (windows-latest)	29m 12s
e2e-web	1h 54m 24s
test-report	7s
e2e-desktop / e2e-report	5s
	3h 23m 55s

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