feat: Add more /review options

[dedrisian-oai]

Adds the following options:

1. Review current changes
2. Review a specific commit
3. Review against a base branch (PR style)
4. Custom instructions

---

+ Adds the following UI helpers:

1. Makes list selection searchable
2. Adds navigation to the bottom pane, so you could add a stack of popups
3. Basic custom prompt view

[aibrahim-oai]

@codex review this

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Chef's kiss.

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[aibrahim-oai]

Overall, amazing functionality. Some points before merging (in order of importance):

• Scope out view_stack
• There should be a way to paginate
• Need to check if it's a git repo or not before rendering those options.
• If we are introducing search we need to be clear on expectations (we are searching the page not the data)

[dedrisian-oai]

As discussed offline, just moved the commit limit # to 100. Will approach pagination at a different time.

[aibrahim-oai]

LGTM. Excited!