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fix(tests): increase heartbeat timeout to 10s; add 2-round freeze-retry loop

Two related fixes:

1. Heartbeat timeout 3s → 10s: page.evaluate() can legitimately block
   while a slow page navigation completes (e.g. Explore page loading
   hundreds of posts). The 3s timeout was triggering false positives on
   these tests. Genuine V8 renderer freezes are indefinite, so 10s still
   catches them with plenty of margin. Also adds a heartbeatBusy guard to
   prevent concurrent in-flight heartbeat callbacks stacking up when
   evaluate is slow.

2. 2-round freeze-retry loop in playwright.post.ts: a first retry can
   itself encounter a freeze (if the spec is heavy even in a fresh
   process). The loop re-checks the freeze file after each retry round and
   does a second retry if needed, up to 2 rounds total. The freeze file is
   cleared before each retry so each round captures only new freezes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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