codeSplitters: review a branch before merge (visible switcher, line diffs, ghost-diff accept/reject) #735

Make branches visible and reviewable in the UI, from a branch switcher outside ⌘K, through a branch's changed lines on the phone page, to reviewing an agent's batch as a ghost diff before it lands.

One agent can take this whole bundle. The original issues are closed into it and keep their full details.

• codeSplitters: a visible branch switcher (Start a branch is only in ⌘K) #701 codeSplitters: a visible branch switcher (Start a branch is only in ⌘K) (in progress: PR codeSplitters: a visible branch switcher, and git-style branch names (#701) #733)
• codeSplitters: the explorer lists main's files while you're on a branch #734 codeSplitters: the explorer lists main's files while you're on a branch
• codeSplitters phone page: show a branch's changed lines before Merge #426 codeSplitters phone page: show a branch's changed lines before Merge
• codeSplitters code view: review an agent's batch before it lands (ghost diff, accept / hold / reject) #467 codeSplitters code view: review an agent's batch before it lands (ghost diff, accept / hold / reject)

Order: Switcher first, then the diff view, which the ghost-diff review builds on.

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