v1.15.3.0 feat(browse): viewport auto / reset to unpin a fixed viewport (#1059)

[gregario]

Summary

Closes #1059. Once browse viewport WxH calls Playwright's setViewportSize, the viewport is pinned. There's no page-level API to undo it — the only way back to window-following is to rebuild the context. Skills that called \$B viewport for responsive testing or breakpoint benchmarks were leaving the browser locked at that size for the rest of the session, with the visible Chrome window noticeably larger than what Claude was rendering into.

Before

$ browse viewport 1280x520
$ browse js \"window.innerWidth + 'x' + window.innerHeight\"
1280x520
# resize Chrome window manually → viewport stays 1280x520
# only escape: browse restart (kills Chrome)

After

$ browse viewport auto
Viewport unpinned — now follows window size (context recreated; refs and load-html content replayed).

# headed mode (real Chrome via /connect-chrome):
$ browse viewport auto
Viewport synced to current window size (1920x1080). Re-run \`viewport auto\` after resizing.

Connection-mode-aware unpin

Mode	Path	Notes
launched (headless)	full recreateContext() with viewport: null	cookies/storage/URLs/tab-ownership preserved via existing save/restore. True follow restored.
headed (launchPersistentContext)	one-shot resync via page.evaluate(window.innerWidth/Height) + setViewportSize	persistent context can't be safely rebuilt (tied to user's Chrome window). Re-run after a resize. Documented in command help.

Implementation notes

• New viewportPinned: boolean on BrowserManager (default true, matches launch).
• setViewport(w, h) sets it true so re-pinning after auto works.
• recreateContext() builds two distinct context-option shapes. Important: Playwright rejects deviceScaleFactor with viewport: null, so the unpinned path omits it. Same constraint the existing headed-launch path already obeys (line 359 — viewport: null with no DSF).
• --scale plus auto/reset is rejected at the parser — scale needs an explicit WxH to multiply.

Test plan

• bun test browse/test/commands.test.ts — 227 pass (4 new tests in dedicated end-of-file describe block).
  • viewport auto unpins a fixed size — pins, unpins, re-pins to a different size; the re-pin takes effect.
  • viewport reset is an alias for auto — same path via the alias.
  • viewport auto preserves cookies across context recreation — sets cookie, unpins, cookie still present.
  • viewport auto rejects --scale combination — input validation.
• Tests live at the end of the file because context recreation renumbers tab IDs, and an existing test in the Tabs describe block hardcodes tab id 1. Running before the Tabs block would break that test.
• Headed-mode path covered by the implementation but not by automated tests (existing tests don't run a real Chrome window).

Files

• browse/src/browser-manager.ts — unpinViewport() + viewportPinned tracking + recreateContext branching
• browse/src/write-commands.ts — viewport auto/reset parsing + --scale rejection
• browse/src/commands.ts — usage docstring
• browse/test/commands.test.ts — 4 new tests
• VERSION, CHANGELOG.md — release v1.15.3.0

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