Two tool-render wins during streaming / on session switch:
1. Every ToolEntry did useStore($activeSessionId)+useStore($currentCwd), so any
session or cwd change re-rendered *every* mounted tool row — but they're only
read inside the preview-artifact effect. Read .get() at fire time instead
(the effect only runs when a previewable target appears); no subscription.
2. memo() AnsiText + CompactMarkdown. Their text props are string values
(value-equal across renders), so memo skips the re-render — and the per-tick
ANSI parse / Streamdown re-run — when a parent ToolEntry re-renders on an
unrelated stream delta.
No behavior change. typecheck + eslint clean; tool fallback tests green (30).
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