fix: Keep the Setup Wizard skill target dropdown available

[hatayama]

Summary

• Keep the skill target dropdown visible after the first fallback is shown.
• Allow users to install multiple targets during one Setup Wizard session.

User Impact

• Installing the first target no longer switches the wizard to the multi-target list immediately.
• Closing and reopening the wizard still allows the normal folder-based mode to be selected.

Changes

• Latch the effective first-install mode in the workflow controller for the wizard lifetime.
• Use the latched mode consistently for rendering and installation.
• Add regression coverage for the latched resolver behavior.

Verification

• Unity compile: 0 errors, 0 warnings.
• Focused resolver tests: 4 passed.
• Full EditMode suite: 2 pre-existing unrelated failures, 7 skipped; the new tests passed.

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 505b4d20-863f-4fb2-81d5-f2f0744d46d7

📥 Commits

Reviewing files that changed from the base of the PR and between 7deb9d2 and 21d580f.

📒 Files selected for processing (3)

• Assets/Tests/Editor/SetupWizardWindowTests.cs
• Packages/src/Editor/Presentation/Setup/SetupWizardSkillsStepPresenter.cs
• Packages/src/Editor/Presentation/Setup/SetupWizardSkillsWorkflowController.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/setup-wizard-keep-first-install-ui

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