feat(cloud-agent): improve repository onboarding

[Drixled]

Summary

Replaces Cloud Agent's generic missing-integration warning with a direct repository-provider onboarding path.

• Links personal users straight to GitHub or GitLab setup instead of sending them to the integrations index.
• Adds Bitbucket for organization sessions while preserving organization-scoped integration routes.
• Lets returning users re-check all available providers independently, so one failed request does not mask another valid connection.
• Extracts the panel into a focused component with personal, organization, and checking states in Storybook.
• Uses a restrained checking shimmer that disables itself under prefers-reduced-motion.

Visual Changes

Before	After

Reviewer Notes

• Review checkSourceControlConnection first: GitHub, GitLab, and organization Bitbucket refresh concurrently via Promise.allSettled, then surface the first actionable provider error only when no connection is available.
• Personal onboarding intentionally omits Bitbucket because Bitbucket integrations are organization-scoped.
• Storybook's preview-head styling keeps the loading canvas dark while the new stories initialize.
• The restored PR's pre-sync CI run passed typecheck, lint, format-check, tests, build, CodeQL, and secret scanning; checks reran after the automatic main sync.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• apps/web/src/components/cloud-agent-next/RepositoryProviderOnboardingPanel.module.css
• apps/web/src/components/cloud-agent-next/RepositoryProviderOnboardingPanel.tsx

Previous Review Summaries (4 snapshots, latest commit 8ce365e)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 8ce365e)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 files)

• apps/storybook/.storybook/preview-head.html

Previous review (commit 903a849)

Status: No Issues Found | Recommendation: Merge

Executive Summary

Reviewed the incremental connection-check typography alignment at current HEAD with high confidence; no correctness, security, performance, accessibility, or memory-lifetime defects were found.

Files Reviewed (1 file)

• apps/web/src/components/cloud-agent-next/RepositoryProviderOnboardingPanel.tsx

Previous review (commit fe1af64)

Status: No Issues Found | Recommendation: Merge

Executive Summary

Reviewed the connection-check UI simplification added since the previous review with high confidence; no correctness, security, performance, accessibility, or memory-lifetime defects were found.

Files Reviewed (1 file)

• apps/web/src/components/cloud-agent-next/RepositoryProviderOnboardingPanel.tsx

Previous review (commit e6acd3d)

Status: No Issues Found | Recommendation: Merge

Executive Summary

Reviewed the three changed onboarding and provider-refresh files at current HEAD with high confidence; no correctness, security, performance, or memory-lifetime defects were found.

Files Reviewed (3 files)

• apps/storybook/stories/cloud-agent/RepositoryProviderOnboardingPanel.stories.tsx
• apps/web/src/components/cloud-agent-next/NewSessionPanel.tsx
• apps/web/src/components/cloud-agent-next/RepositoryProviderOnboardingPanel.tsx

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_{Reviewed by gpt-5.6-sol · Input: 66.5K · Output: 7K · Cached: 415.7K}

_{Review guidance: REVIEW.md from base branch main}