Remove custom analytics in favor of Vercel defaults

The changes remove custom analytics tracking in favor of using Vercel's
default page view tracking functionality.

src/app/api/publications/[filename]/route.ts

@@ -1,6 +1,4 @@
 import { NextRequest, NextResponse } from "next/server";
-import { track } from "@vercel/analytics/server";
-import { parseBibtex } from "~/lib/bibtex";
 import { readFile } from "fs/promises";
 import { join } from "path";
 
@@ -16,47 +14,7 @@ export async function GET(
   }
 
   try {
-    // Read the BibTeX file to get publication metadata
-    const bibtexPath = join(process.cwd(), "public", "publications.bib");
-    const bibtexContent = await readFile(bibtexPath, "utf-8");
-    const publications = parseBibtex(bibtexContent);
-
-    // Find the publication that matches this PDF
-    const publication = publications.find(
-      (pub) =>
-        pub.paperUrl?.includes(filename) ||
-        pub.posterUrl?.includes(filename) ||
-        pub.slidesUrl?.includes(filename),
-    );
-
-    // Track the PDF access
-    if (publication) {
-      const isPoster = publication.posterUrl?.includes(filename);
-      const isSlides = publication.slidesUrl?.includes(filename);
-
-      let fileType = "paper";
-      if (isPoster) fileType = "poster";
-      if (isSlides) fileType = "slides";
-
-      await track("Publication PDF Access", {
-        title: publication.title,
-        type: publication.type,
-        year: publication.year.toString(),
-        pdf_type: fileType,
-        citation_key: publication.citationKey || "",
-        venue: publication.venue || "",
-        access_method: "direct_url",
-        filename: filename,
-      });
-    } else {
-      // Track unknown PDF access
-      await track("Unknown PDF Access", {
-        filename: filename,
-        access_method: "direct_url",
-      });
-    }
-
-    // Serve the PDF file
+    // Serve the PDF file directly - Vercel Analytics will automatically track the route access
     const pdfPath = join(process.cwd(), "public", "publications", filename);
     const pdfBuffer = await readFile(pdfPath);
 
@@ -69,13 +27,6 @@ export async function GET(
     });
   } catch (error) {
     console.error("Error serving PDF:", error);
-
-    // Track the error
-    await track("PDF Access Error", {
-      filename: filename,
-      error: error instanceof Error ? error.message : "Unknown error",
-    });
-
     return new NextResponse("PDF not found", { status: 404 });
   }
 }