Group consecutive tool calls into a shared render block

[annzhang-db]

Summary

• Adds groupConsecutiveToolSegments to collapse runs of consecutive dynamic-tool segments into a single tool-group render block
• Replaces the inline partSegments.map render loop with renderBlocks.map, routing tool groups to a new MessageToolGroup component
• Extracts all tool rendering logic (MCP approval branch + regular tool branch) into a ToolPartRenderer component

Test plan

• Verify single tool calls render identically to before
• Verify consecutive tool calls are grouped into a shared wrapper
• Verify MCP approval flow still works (approve/deny buttons, state transitions)
• Verify OAuth inline errors still render correctly

https://ann-test-parallel-agent-6051921418418893.staging.aws.databricksapps.com/

Screen.Recording.2026-05-07.at.4.49.42.PM.mov

[bbqiu]

in this demo video, they are all marked as completed at the same time. is this actually the case?

seems a little unlikely unless we're batching the consumption of the events into one update in the UI or some batching is happening on the SA side of things

[bbqiu]

lgtm, but let's figure out what's going on w/ the batching of the requests: #190 (comment)

cna we also get AI to codify this behavior in a test (grouping of tool calls into one rendering block)