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Long Write tool inputs can spend minutes streaming the file body before the tool executes, so the desktop transcript now decodes the pending content field into a lightweight Writer preview. The preview intentionally uses a bounded plain-text window while the tool is pending, then keeps the existing full diff rendering once the Write call completes. Constraint: Write.content arrives as streaming tool input before the filesystem write executes. Rejected: Render a live DiffViewer for every input delta | repeated diff and syntax work would reintroduce long-session jank. Confidence: high Scope-risk: moderate Directive: Keep pending Writer rendering lightweight and bounded; reserve full diff rendering for completed Write calls. Tested: cd desktop && bun run test src/components/chat/chatBlocks.test.tsx -- --runInBand Tested: cd desktop && bun run test src/stores/chatStore.test.ts -- --runInBand Tested: bun run check:desktop Not-tested: Live provider long Write smoke after the UI patch.