Add opencode configuration,refactoring and improve error handling

.codegraph/.gitignore

@@ -0,0 +1,5 @@
+# CodeGraph data files — local to each machine, not for committing.
+# Ignore everything in .codegraph/ except this file itself, so transient
+# files (the database, daemon.pid, sockets, logs) never show up in git.
+*
+!.gitignore

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint-and-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Type check + build
+        run: npm run build

.gitignore

@@ -30,3 +30,5 @@ stats.html
 
 #Ignore cursor AI rules
 .cursor/rules/codacy.mdc
+
+docs/

backend/index.js

@@ -146,25 +146,25 @@ app.post("/pdf", async (req, res) => {
     return res.status(400).json({ message: "HTML content is required" });
   }
 
-  try {
-    let browser;
+  let browser;
 
+  try {
     if (process.env.NODE_ENV === "development") {
-      // Use standard Puppeteer locally
       browser = await puppeteer.launch({
         headless: true,
         args: ["--no-sandbox", "--disable-setuid-sandbox"],
       });
-    }
-
-    if (process.env.NODE_ENV === "production") {
-      // Use Puppeteer with Chromium in production
+    } else if (process.env.NODE_ENV === "production") {
       browser = await puppeteerCore.launch({
         args: Chromium.args,
         defaultViewport: Chromium.defaultViewport,
         executablePath: await Chromium.executablePath(),
         headless: Chromium.headless,
       });
+    } else {
+      return res.status(500).json({
+        message: "Server misconfigured: NODE_ENV is not set",
+      });
     }
 
     const page = await browser.newPage();
@@ -181,18 +181,19 @@ app.post("/pdf", async (req, res) => {
       },
     });
 
-    await browser.close();
-
-    // Puppeteer 23.x returns a Uint8Array from page.pdf(); Express's
-    // res.send() only recognizes Buffer instances, so wrap it explicitly
-    // and use res.end() to send raw bytes without body processing.
     res.setHeader("Content-Type", "application/pdf");
     res.end(Buffer.from(pdfBuffer));
   } catch (error) {
     console.error("PDF Generation error:", error);
-    res
-      .status(500)
-      .json({ message: "Internal server error: " + error.message });
+    res.status(500).json({ message: "Internal server error" });
+  } finally {
+    if (browser) {
+      try {
+        await browser.close();
+      } catch (closeError) {
+        console.error("Failed to close browser:", closeError);
+      }
+    }
   }
 });
 

opencode.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "https://opencode.ai/config.json",
+  "mcp": {
+    "context7": {
+      "type": "local",
+      "command": ["npx", "-y", "@upstash/context7-mcp"],
+      "enabled": true
+    }
+  }
+}