[afrojun]

Summary

sequenceDiagram
    participant S as Source extension
    participant H as ProfileBar helper
    participant D as Destination extension
    S->>H: openURLs / openGroup { urls, splits: [[1, 2]] }
    H->>H: TabSplits.parse (neighbouring pairs, in range, each tab once)
    H->>D: relay "open" or claimGroup { urls, splits }
    D->>D: create tabs, then TabSplits.rebuild → chrome.tabs.createSplit

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• Moving either half of a split view from the tab strip moves both. Right-clicking a page inside one half still moves only that page.
• Group moves carry the splits inside the group, and the receiver splits after grouping, because Chrome splits only within one group.
• extension/tab-splits.js holds both ends of the extension's side and is shared by the service worker and the group receiver.
• Page tests now load each page's scripts in the order its HTML lists them, so a missing script fails the test.

Both ends of the protocol change in this PR, as AGENTS.md requires. Older versions on either side ignore splits and still move the tabs, without the split. Stacked on #16.

Evidence

• Before: split halves moved as separate tabs, and the destination never split them.
  After: 75 extension tests and ./test.sh pass. Breaking each part (source pairs, partner expansion, arrival rebuild, group rebuild) in a scratch copy fails a test.
• Live, Chrome 156, Profile 3 → Profile 2 through the real menu code (moveToProfile):
  • One half of a split: both halves left the source and arrived split at neighbouring indexes.
  • A group of three with a split inside: it arrived with its title and colour, and the split was rebuilt inside the group.
• Pre-push review finding: [[Int.max, 0]] overflowed before the range check and would crash the helper. Fixed by checking the range first, with Int.max and -1 regression cases.

Merge Danger

Door: two-way

Blast Radius: native protocol

Release ProfileBar 1.6.0 before the extension update that sends splits. In the other order nothing breaks, but splits aren't rebuilt until the app catches up.

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