fix: resolve runtime crashes in tool-ui components and backend import errors

Backend:
- Remove dead imports (display_image, link_preview, knowledge_base) from tools registry and __init__
- Delete orphaned elif chain (lines 784-1046) in knowledge_base.py left after asyncio.gather refactor
- Add missing NotionAPIError class to notion_history.py

Frontend:
- Add display-image.tsx, link-preview.tsx, scrape-webpage.tsx tool UI components
- Fix GeneratePodcastToolUI: add null guard for no-props render + optional chaining on status/args
- Fix SaveMemoryToolUI/RecallMemoryToolUI: add null guard when rendered without props in provider
- Update launch.json to use pnpm on port 3999

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

surfsense_web/components/tool-ui/scrape-webpage.tsx

@@ -0,0 +1,56 @@
+"use client";
+
+import { makeAssistantToolUI } from "@assistant-ui/react";
+import { z } from "zod";
+import { GlobeIcon, Loader2Icon, CheckCircle2Icon, XCircleIcon } from "lucide-react";
+
+const ScrapeWebpageArgsSchema = z.object({
+	url: z.string(),
+}).passthrough();
+
+const ScrapeWebpageResultSchema = z.object({
+	url: z.string().optional(),
+	title: z.string().optional(),
+	content: z.string().optional(),
+	error: z.string().optional(),
+	success: z.boolean().optional(),
+}).passthrough();
+
+type ScrapeWebpageArgs = z.infer<typeof ScrapeWebpageArgsSchema>;
+type ScrapeWebpageResult = z.infer<typeof ScrapeWebpageResultSchema>;
+
+export const ScrapeWebpageToolUI = makeAssistantToolUI<ScrapeWebpageArgs, ScrapeWebpageResult>({
+	toolName: "scrape_webpage",
+	render: ({ args, result, status }) => {
+		const isLoading = status.type === "running";
+		const url = result?.url ?? args?.url;
+		const hasError = result?.error || result?.success === false;
+		const isSuccess = result?.success !== false && !result?.error && status.type === "complete";
+
+		return (
+			<div className="my-3 flex items-center gap-3 rounded-lg border bg-card/60 px-4 py-3">
+				<div className="flex size-8 items-center justify-center rounded-full bg-primary/10 shrink-0">
+					{isLoading ? (
+						<Loader2Icon className="size-4 animate-spin text-primary" />
+					) : hasError ? (
+						<XCircleIcon className="size-4 text-destructive" />
+					) : (
+						<GlobeIcon className="size-4 text-primary" />
+					)}
+				</div>
+				<div className="min-w-0 flex-1">
+					<p className="text-sm font-medium">
+						{isLoading ? "Scraping webpage..." : hasError ? "Failed to scrape" : "Scraped webpage"}
+					</p>
+					{url && (
+						<p className="text-xs text-muted-foreground truncate">{url}</p>
+					)}
+					{hasError && result?.error && (
+						<p className="text-xs text-destructive mt-0.5">{result.error}</p>
+					)}
+				</div>
+				{isSuccess && <CheckCircle2Icon className="size-4 text-green-500 shrink-0" />}
+			</div>
+		);
+	},
+});