refactor sending prompt to agent from UI

[adboio]

Problem

trying to add more things that prompt the agent automatically, and more annotations to the review panel, was getting messy

Changes

small refactor:

• adds sendPromptToAgent util that:
  • takes in a prompt+task
  • puts the review panel back to split view if it's open in full view
  • focuses the main session tab
  • sends the prompt to the agent
• broke out the prompt builders into a new util reviewPrompts.ts
• made CommentAnnotationself-contained -- now it handles building prompt and sending to agent -- so we don't have to thread a million things through a million components

i still don't like how task/taskId are getting drilled a million levels deep everywhere, but that happens throughout the whole codebase... i considered a small task context, but it's pretty deeps, i'll revisit that later... for now this just avoids drilling allll the annotation stuff

How did you test this?

manually

[adboio]

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• feat(code): show PR comments in review panel #1536
• refactor sending prompt to agent from UI #1539 👈 (View in Graphite)
• chore: add relative time utils #1535
• feat(code): add PR status and actions to cloud tasks #1525
• 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
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