fix(brainbar): title injection bursts from chunk content

[EtanHey]

Summary

• make injection burst card titles use the first retrieved chunk summary/content
• keep source prompts as grouping keys and Triggered by subtitles only
• add regression coverage for the visual failure caught after rebuilding PR feat(brainbar): humanize injections tab (item F-2) #336

Verification

• red: swift test --package-path brain-bar --filter InjectionPresentationTests/testBurstSummaryTitleUsesChunkContentInsteadOfSourcePrompt
• swift test --package-path brain-bar --filter 'InjectionConversationSelectionTests|InjectionEventTests|InjectionPresentationTests|DatabaseTests/testListInjectionEventsLoadsChunkDisplayMetadata'
• swift test --package-path brain-bar
• pre-push gate: Python pytest suite, MCP registration, isolated eval/hook routing, bun, FTS regression

Follow-up to Item F Fix 2 visual verification; PR #336 exposed that burst titles could still display source prompt text in live BrainBar.

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Note

Low Risk
Presentation-only change in BrainBar injection burst titles; grouping and data paths are unchanged.

Overview
Injection burst card titles now show the first retrieved chunk’s summary/content (via existing previewChunks / displayText) instead of repeating the source/trigger prompt. When no chunk text is available, the fallback is shortened to “N chunk(s) injected” without quoting topicOrSource.

Burst grouping still keys on session + query (topicOrSource); only the visible title string changed. A regression test covers the case where the query is a long orchestrator-style prompt but chunk content should drive the title.

^{Reviewed by Cursor Bugbot for commit 48177f1. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix Burst.summaryTitle to show first chunk's display text instead of source/prompt

• Burst.summaryTitle in InjectionPresentation.swift now returns the first preview chunk's displayText when it is non-empty.
• The fallback (when no chunk text is available) drops the source/prompt and returns 'N chunk(s) injected' instead of 'N chunk(s) injected from "<source>"'.
• Behavioral Change: burst titles in the brain bar will show chunk content rather than the source/prompt label when chunk text is present.

^{Macroscope summarized 48177f1.}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 67821c21-42f3-4a22-aa53-893c11c5ef87

📥 Commits

Reviewing files that changed from the base of the PR and between cffb5ae and 48177f1.

📒 Files selected for processing (2)

• brain-bar/Sources/BrainBar/InjectionPresentation.swift
• brain-bar/Tests/BrainBarTests/InjectionPresentationTests.swift

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/brainbar-item-F-injections-title-visual-fix

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