fix(web): fold single trailing activity - #9739
Effect Service Conventions: No issues found
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The only in-scope changed file is apps/web/src/components/chat/MessagesTimeline.logic.ts (test files are excluded by check configuration). The change adds a isSingleTrailingActivity condition to deriveTurnFolds, pure client-side timeline derivation logic with no Effect service definition, layer, error class, runtime boundary, or dependency acquisition. The Effect service conventions do not apply to these lines, and the change is accompanied by updated logic tests.
🔍 Agent activity — 2 tool calls
💭 The diff touches MessagesTimeline.logic.ts, which is React chat timeline logic rather than an Effect service, so I doubt there are any Effect convention violations here. I'll peek at the file just to confirm there's no Effect involvement.
1. browse_code — apps/web/src/components/chat/MessagesTimeline.logic.ts
2. browse_code — apps/web/src/components/chat/MessagesTimeline.logic.ts
💭 This is pure UI logic with no Effect service involvement, so no backend behavior changed here — and since tests were already added, the frontend requirement is satisfied.
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