feat(web_search): truncate results in TUI view, expand with ctrl+o

Add renderResult showing a collapsed preview (count + first 3 results)
until expanded via Ctrl+O. The full markdown still goes to the model via
content, so only the display is affected.

index.ts

@@ -1,7 +1,12 @@
 // Pi-Web Extension - Registers `web_search` and `web_fetch` tools backed by
 // a shared headless Firefox session. Provider config lives in
 // ~/.pi/pi-web/config.json (env overrides supported).
-import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
+import {
+  keyHint,
+  type AgentToolResult,
+  type ExtensionAPI,
+  type Theme,
+} from "@mariozechner/pi-coding-agent";
 import { Text } from "@mariozechner/pi-tui";
 import { Type } from "typebox";
 import { ConfigError, loadConfig, resolveSettings } from "./src/config.ts";
@@ -10,6 +15,9 @@ import { searchKagi } from "./src/providers/kagi.ts";
 import { searchSearxng } from "./src/providers/searxng.ts";
 import { SearchError, type SearchResult } from "./src/types.ts";
 
+// Collapsed-view preview cap. The full list still goes to the model via `content`.
+const PREVIEW_RESULTS = 3;
+
 function formatResults(results: SearchResult[]): string {
   if (results.length === 0) return "(no results)";
   return results
@@ -17,6 +25,30 @@ function formatResults(results: SearchResult[]): string {
     .join("\n\n");
 }
 
+function renderSearchResult(
+  result: AgentToolResult<unknown>,
+  expanded: boolean,
+  theme: Theme,
+): Text {
+  const fullText = result.content[0]?.type === "text" ? result.content[0].text : "";
+  const raw = (result.details as { raw?: SearchResult[] } | undefined)?.raw;
+
+  // Expanded or unavailable details: show the full markdown the model received.
+  if (expanded || !raw || raw.length === 0) {
+    return new Text(fullText, 0, 0);
+  }
+
+  let text = theme.fg("muted", `${raw.length} result(s):`);
+  for (const r of raw.slice(0, PREVIEW_RESULTS)) {
+    text += `\n${theme.fg("toolTitle", r.title)} ${theme.fg("dim", r.url)}`;
+  }
+  const more = raw.length - PREVIEW_RESULTS;
+  if (more > 0) {
+    text += `\n${theme.fg("dim", `... ${more} more (${keyHint("app.tools.expand", "to expand")})`)}`;
+  }
+  return new Text(text, 0, 0);
+}
+
 function formatFetch(r: FetchResult): string {
   const header =
     r.title && r.title.trim()
@@ -55,6 +87,9 @@ export default function (pi: ExtensionAPI) {
       text.setText(theme.fg("toolTitle", theme.bold(`web_search "${display}"`)));
       return text;
     },
+    renderResult(result, { expanded }, theme) {
+      return renderSearchResult(result, expanded, theme);
+    },
     async execute(_toolCallId, params) {
       try {
         const results = await runSearch(params.query);