fix(chat): share thinking and preserve natural activity labels

[waleedlatif1]

Summary

• Share one gooey thinking indicator across empty parallel and nested agents. Show individual rows when meaningful activity arrives, preserving tool history, approval controls, icons, and existing spacing and timing.
• Preserve successful activity descriptions without adding “Completed:”; retain known past-tense conversions and explicit failure, stopped, and skipped outcomes.

Type of Change

• Bug fix

Testing

849 targeted tests passed across activity rendering, nested and parallel agents, terminal and permission states, narration, transcript sizing, completion labels, browser/integration icons, and the thinking loader. Type-check, lint, all 46 audits, block-registry and docs-manifest checks passed. Verified the rendered comparison in dark and light modes, including first-action transitions, row spacing, expansion, and the Google favicon.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 14, 2026 6:05pm UTC

[waleedlatif1]

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; the previous documentation requirement is satisfied and no new actionable defects remain.

Summary

• Filters empty and whitespace-only agent lanes from rendered activity.
• Keeps pending, terminal, approval, and nested activity visible.
• Preserves successful descriptions unless a known past-tense conversion applies.
• Adds focused coverage for shared thinking, activity transitions, and outcome labels.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Streaming assistant turn] --> B{Pending agent lanes?}
  B -->|Only empty lanes| C[Show shared turn-level thinking indicator]
  B -->|Meaningful activity exists| D[Render agent activity rows]
  D --> E{Tool outcome}
  E -->|Executing| F[Show active description]
  E -->|Success| G[Apply known past-tense rewrite or preserve description]
  E -->|Failed, stopped, or skipped| H[Show explicit terminal outcome]

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[waleedlatif1]

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