fix(coding-agent): tighten HTML export tool spacing

packages/coding-agent/src/core/export-html/ansi-to-html.ts

@@ -254,5 +254,5 @@ export function ansiToHtml(text: string): string {
  * Each line is wrapped in a div element.
  */
 export function ansiLinesToHtml(lines: string[]): string {
-	return lines.map((line) => `<div class="ansi-line">${ansiToHtml(line) || "&nbsp;"}</div>`).join("\n");
+	return lines.map((line) => `<div class="ansi-line">${ansiToHtml(line) || "&nbsp;"}</div>`).join("");
 }

packages/coding-agent/src/core/export-html/template.css

@@ -505,11 +505,16 @@
     }
 
     .tool-output > div,
-    .output-preview,
-    .output-full {
+    .output-preview > div,
+    .output-full > div {
       margin: 0;
       padding: 0;
       line-height: var(--line-height);
+    }
+
+    .tool-output > div:not(.output-preview):not(.output-full),
+    .output-preview > div:not(.expand-hint),
+    .output-full > div:not(.expand-hint) {
       white-space: pre-wrap;
     }
 

packages/coding-agent/src/core/export-html/tool-renderer.ts

@@ -41,6 +41,20 @@ export interface ToolHtmlRenderer {
  * The renderer looks up tool definitions and invokes their renderCall/renderResult
  * methods, converting the resulting TUI Component output (ANSI) to HTML.
  */
+const ANSI_ESCAPE_REGEX = /\x1b\[[\d;]*m/g;
+
+function isBlankRenderedLine(line: string): boolean {
+	return line.replace(ANSI_ESCAPE_REGEX, "").trim().length === 0;
+}
+
+function trimRenderedResultLines(lines: string[]): string[] {
+	let start = 0;
+	let end = lines.length;
+	while (start < end && isBlankRenderedLine(lines[start])) start++;
+	while (end > start && isBlankRenderedLine(lines[end - 1])) end--;
+	return lines.slice(start, end);
+}
+
 export function createToolHtmlRenderer(deps: ToolHtmlRendererDeps): ToolHtmlRenderer {
 	const { getToolDefinition, theme, cwd, width = 100 } = deps;
 
@@ -133,7 +147,7 @@ export function createToolHtmlRenderer(deps: ToolHtmlRendererDeps): ToolHtmlRend
 					createRenderContext(toolCallId, renderedResultComponents.get(toolCallId), false, false, isError),
 				);
 				renderedResultComponents.set(toolCallId, collapsedComponent);
-				const collapsed = ansiLinesToHtml(collapsedComponent.render(width));
+				const collapsed = ansiLinesToHtml(trimRenderedResultLines(collapsedComponent.render(width)));
 
 				// Render expanded
 				const expandedComponent = toolDef.renderResult(
@@ -143,7 +157,7 @@ export function createToolHtmlRenderer(deps: ToolHtmlRendererDeps): ToolHtmlRend
 					createRenderContext(toolCallId, renderedResultComponents.get(toolCallId), true, false, isError),
 				);
 				renderedResultComponents.set(toolCallId, expandedComponent);
-				const expanded = ansiLinesToHtml(expandedComponent.render(width));
+				const expanded = ansiLinesToHtml(trimRenderedResultLines(expandedComponent.render(width)));
 
 				return {
 					...(collapsed && collapsed !== expanded ? { collapsed } : {}),