ui: added single line reasoning preview (#23601)

* webui: added single line reasoning preview.

* patch: reduce width slightly for the previewing section

* refactor: move formatter constants to the right file

* feat: reimplement reasoning preview with throttled dynamic per-line rendering

* chore: fix spacing

Co-authored-by: Aleksander Grygier <aleksander.grygier@gmail.com>

* chore: refactor to requested changes

* refactor: grouped by capture pattern instead of block-level + inline

* ui: fax interrupt state only trigger for 1st reasoning message

* chore: make reasoning preview respects showThoughtInProgress setting

* chore; newline at EOF

Co-authored-by: Aleksander Grygier <aleksander.grygier@gmail.com>

* fix: thread rawContent so collapsible content can handle compute preview

* patch: showThoughtInProgress accidentally blocks rawContent being passed

* chore: fix lint

* chore: change smoke test

---------

Co-authored-by: Aleksander Grygier <aleksander.grygier@gmail.com>

tools/ui/src/lib/utils/agentic.ts

@@ -18,6 +18,7 @@ export interface AgenticSection {
 	toolArgs?: string;
 	toolResult?: string;
 	toolResultExtras?: DatabaseMessageExtra[];
+	wasInterrupted?: boolean;
 }
 
 /**
@@ -51,7 +52,8 @@ function deriveSingleTurnSections(
 		const isPending = isStreaming && !hasContentAfterReasoning;
 		sections.push({
 			type: isPending ? AgenticSectionType.REASONING_PENDING : AgenticSectionType.REASONING,
-			content: message.reasoningContent
+			content: message.reasoningContent,
+			wasInterrupted: !isStreaming && !hasContentAfterReasoning
 		});
 	}