feat: add expand/collapse (Ctrl+O) rendering to web_search and read_page

Both tools dumped full output into the TUI. Add a shared renderExpandableText
helper (src/domains/render.ts) mirroring browser_execute_js: a compact preview
by default, full body on expand via keyHint("app.tools.expand"). Tools stash a
{summary, body, fullOutputPath} render payload in details; the full text still
goes to the LLM via ToolOk.text. Also surfaces engine + result count in the
web_search summary line (closes the S4 observability gap).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/src/domains/search/web-search.ts b/src/domains/search/web-search.ts
index e5d343d..41a0f36 100644
--- a/src/domains/search/web-search.ts
+++ b/src/domains/search/web-search.ts
@@ -9,6 +9,7 @@ import {
   openIsolatedTab,
   waitForIsolatedLoad,
 } from "../isolated-tab";
+import { renderExpandableText } from "../render";
 import { buildSerpExtractionExpr } from "./extract";
 import { classifySerp, parseGoogleSerp, type SearchResult, type SerpExtraction } from "./google-serp";
 
@@ -81,13 +82,19 @@ export const webSearchTool = defineBrowserTool({
         });
       }
 
-      const truncated = await applyTruncation(formatResults(args.query, results), "search");
+      const body = formatResults(args.query, results);
+      const truncated = await applyTruncation(body, "search");
       return ok({
         text: truncated.text,
         details: {
           results,
           engine: "google",
           query: args.query,
+          render: {
+            summary: `${results.length} result(s) · google · "${args.query}"`,
+            body,
+            ...(truncated.fullOutputPath !== undefined ? { fullOutputPath: truncated.fullOutputPath } : {}),
+          },
           ...(truncated.fullOutputPath !== undefined ? { fullOutputPath: truncated.fullOutputPath } : {}),
         },
       });
@@ -95,6 +102,9 @@ export const webSearchTool = defineBrowserTool({
       await closeIsolatedTab(client, tab);
     }
   },
+  renderResult(result, expanded, theme) {
+    return renderExpandableText("web_search", result, expanded, theme);
+  },
 });
 
 const safeParse = (text: string): unknown => {