Auto-discover local repos; declutter Connected Accounts and check-in start

[qiyundai]

Summary

• Repos: replaced manual "add repo by path" with auto-discovery — the user picks one or more parent "code root" folders in Settings, and mypa scans them for git checkouts, deriving the GitHub repo/default branch and filtering to the configured GitHub-org scope. Authoring stays off by default and is opt-in per repo, since enabling it lets mypa open real PRs against that checkout.
• Connected Accounts: the "About You" surface list now only renders identity surfaces backed by an enabled MCP server — no more "not connected" placeholder rows for services the user never enabled (e.g. Linear/Notion).
• Check-in: starting a check-in now shows the existing thinking-dots indicator immediately, instead of an empty card until the opening briefing's first streamed chunk arrives.

Reviewed by three parallel review passes (correctness, security, conventions) before push; fixes applied from that review:

• Reconciliation no longer creates a duplicate discovered RepoLink when a scanned path already has a manual link.
• rescanRepos() now queues a follow-up scan when called mid-scan, so addCodeRoots/removeCodeRoot always return results reflecting their own just-written config, not a stale in-flight scan.
• addCodeRoots rejects filesystem/drive roots and the home directory outright, and the scanner yields to the event loop periodically, so a bad root can't hang or repeatedly re-scan the whole disk.
• Removed the now-unreachable legacy addRepoLink/removeRepoLink functions rather than keeping them as unused back-compat code.
• Updated docs-dev/renderer.md, which the first pass had missed.

Test plan

• npm run typecheck passes
• npm run build passes
• Manual: add a code root in Settings, confirm repos are discovered with authoring off by default; toggle authoring/edit Jira keys, rescan, confirm edits persist; remove a root and confirm its repos disappear
• Manual: confirm Connected Accounts only shows enabled surfaces
• Manual: start a check-in and confirm the thinking indicator shows immediately

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