fix(chat): clarify activity spacing and unify overflow fades

[waleedlatif1]

Summary

• Give prose and interaction cards 16px separation from activity, while keeping consecutive tool rows 8px apart. Preserve spacing when cards are answered or dismissed.
• Keep activity text the same 15px size as response text with existing muted colors, and remove trailing dots from Thinking.
• Reuse OverflowText's 16px fade size for expanded activity, search results, and tables through the existing scroll-fade component.

Type of Change

• Bug fix

Testing

• Manually verified light/dark themes, narrow layouts, answered/dismissed cards, nested activity, and top/middle/bottom scroll fades.
• All 766 message-content tests passed, including eight new render-level regressions for activity adjacency, card states, preserved tool nodes, and terminal actions. Fade coverage also passed: 276 consumer tests and 19 primitive tests.
• Type-check and lint-check passed across 26 workspaces; all 49 audits and generated-artifact checks passed.

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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Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 24, 2026 9:21pm UTC

[waleedlatif1]

@greptile

[waleedlatif1]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

@waleedlatif1 I have started the AI code review. It will take a few minutes to complete.

[cubic-dev-ai]

No issues found across 21 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; no outstanding findings or new actionable defects were identified.

Summary

The PR adjusts chat activity and card spacing, standardizes overflow-fade sizing, and removes the trailing dots from “Thinking.” Changes since the previous review add render-level spacing tests, SSE idle recovery, and a shared row-action control used by sidebars, dropdowns, and tabs.

• The new tests cover activity adjacency and active, answered, and dismissed card boundaries.
• Both previous spacing-test threads are resolved, and the added tests address their requested coverage.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Stream[Initial or tail SSE stream] --> Reader[Read SSE chunks]
  Reader -->|Event or keepalive| Reader
  Reader -->|45 seconds without a chunk| Cancel[Cancel silent reader]
  Cancel --> Reconnect[Resume from saved cursor]

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[waleedlatif1]

@greptile

[waleedlatif1]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

@waleedlatif1 I have started the AI code review. It will take a few minutes to complete.

[cubic-dev-ai]

No issues found across 22 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}