Simplify and migrate onboarding screens to SwiftUI

[bgoncal]

Summary

Screenshots

Link to pull request in Documentation repository

Documentation: home-assistant/companion.home-assistant#

Any other notes

onboarding-low.mov

[emerge-tools]

1 build increased size

Name	Version	Download	Change	Install	Change	Approval
Home Assistant io.robbie.HomeAssistant	2025.4 (2025.4847)	60.3 MB	⬆️ 131.0 kB (0.22%)	129.0 MB	⬆️ 239.6 kB (0.19%)	N/A

Home Assistant 2025.4 (2025.4847)
io.robbie.HomeAssistant

⚖️ Compare build
📦 Install build
⏱️ Analyze build performance

Total install size change: ⬆️ 239.6 kB (0.19%)
Total download size change: ⬆️ 131.0 kB (0.22%)

Largest size changes

Item	Install Size Change
Shared	⬆️ 61.4 kB
📝 logo-horizontal-text-dark.png	⬆️ 17.3 kB
🗑 HomeAssistant.OnboardingManualURLViewController	⬇️ -17.2 kB
🗑 HomeAssistant.OnboardingScanningViewController	⬇️ -16.7 kB
📝 logo-horizontal-text.png	⬆️ 16.4 kB

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Comment trigger: Size diff threshold of 100.00kB exceeded

[codecov]

Codecov Report

Attention: Patch coverage is 49.45652% with 93 lines in your changes missing coverage. Please review.

Project coverage is 45.75%. Comparing base (99c6596) to head (b883d0f).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...ared/DesignSystem/Components/PrivacyNoteView.swift	0.00%	88 Missing ⚠️
...hared/API/Webhook/Sensors/WatchBatterySensor.swift	0.00%	2 Missing ⚠️
Sources/Shared/Environment/Environment.swift	50.00%	2 Missing ⚠️
...d/DesignSystem/Components/ExternalLinkButton.swift	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3527      +/-   ##
==========================================
+ Coverage   45.33%   45.75%   +0.41%     
==========================================
  Files         225      228       +3     
  Lines       13390    13606     +216     
==========================================
+ Hits         6071     6225     +154     
- Misses       7319     7381      +62     

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[TimoPtr]

Quite a big PR 👏🏻 I don't see any test is that on purpose? Do we have screenshot testings on this new screens?

[bgoncal]

Quite a big PR 👏🏻 I don't see any test is that on purpose? Do we have screenshot testings on this new screens?

Still coming in this PR