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Taylor Hoandnpub1223z34hd7vtwc6qj4s7flsxkj644nlre2nthu7lrrmkumhu3xddsrx9r6w ab29e2c086 test(agents): cover transcript render-decision helpers + sweep dead branches

The activity-feed UI components claimed coverage "for grouping,
presentation, and tool summaries" but the render-decision logic wiring
those helpers into the rendered components had none. The node test
harness only strips .ts (no JSX/DOM), so this extracts the pure
decision logic out of the .tsx components into sibling .ts modules and
tests it directly — matching the existing helper-test convention.

- AgentSessionToolItem.tsx: extract isInlineImageData (the data:image/
  passthrough guard), getToolDurationDisplay/formatDurationMs (duration
  fallback chain), and parseToolResultValue (JSON double-parse) into
  agentSessionUtils.ts. resolveImageSrc stays in the component (Tauri
  dep) but is now built on the testable isInlineImageData predicate.
- ManagedAgentSessionPanel.tsx: extract scopeByChannel,
  deriveLatestSessionId, and resolveRawRailLayout (the raw-ACP toggle
  decision) into agentSessionPanelLayout.ts.
- describeRawEvent (raw-view labels) gets direct coverage.

New tests: agentSessionToolItemHelpers.test.mjs, rawEventRail.test.mjs,
agentSessionPanelLayout.test.mjs (32 cases). Total suite 766 -> 798.

Also sweeps the two parked dead branches:
- agentSessionTranscriptGrouping.ts: the isSetupLifecycle guard in the
  activity loop can never fire (setup items are already in `consumed`
  and filtered out of `activity`).
- agentSessionToolSummary.ts: the `base === "shell"` ternary inside the
  DEVELOPER_TOOL_BASES branch is unreachable (shell returns earlier);
  simplified to return "dev_mcp".

Gates: biome check, tsc, vite build, 798 unit tests all green.

2026-06-15 20:12:15 -07:00