feat(code): add PR status and actions to cloud tasks

[adboio]

Problem

you can't take any actions on your PR from a cloud task

Changes

as a first step in the direction of "ph code helping you merge PRs", adding some logic to fetch PR details and add simple actions for draft/open/close/etc... notes:

• this will be used as the foundation for more PR stuff like comments and CI
• much of this will also be re-used for local tasks when we get to that point

cloud-pr-actions.mp4 (uploaded via Graphite)

How did you test this?

manually

[adboio]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(code): show PR comments in review panel #1536
• refactor sending prompt to agent from UI #1539
• chore: add relative time utils #1535
• feat(code): add PR status and actions to cloud tasks #1525 👈 (View in Graphite)
• fix(code): truncate text properly in tool call output #1498
• feat(code): remove right sidebar #1497
• feat(code): tree view for changed files list #1494
• feat(code): use remote files for cloud review panel #1491
• feat(code): remove cloud status bar, add pr view button #1476
• main

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