Speed up terminal replay catch-up

[danshapiro]

Summary

• Mark attach replay output frames as replay-mode writes in TerminalView.
• Coalesce adjacent replay writes so long inactive-tab backlogs drain as larger terminal writes instead of thousands of small frame-limited chunks.
• Give replay queue work a larger frame budget while preserving the existing live-output budget.

Verification

• npm run test:vitest -- test/unit/client/components/terminal/terminal-write-queue.test.ts test/e2e/terminal-create-attach-ordering.test.tsx test/unit/client/components/TerminalView.lifecycle.test.tsx --run
• npm run check