feat(capture): add minimal browser extension

browser-extension/README.md

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+# Jobjakt Quick Capture
+
+The Manifest V3 extension opens the current page or selected link in Jobjakt's existing reviewed import flow. It does not scrape page content, store credentials, or submit an application automatically.
+
+## Install locally
+
+1. Open `chrome://extensions` (or the equivalent extensions page in Edge).
+2. Enable developer mode.
+3. Choose **Load unpacked** and select this `browser-extension` folder.
+4. Open a vacancy and click the Jobjakt extension, or use **Save vacancy to Jobjakt** from the page/link context menu.
+
+The Jobjakt add-job dialog opens with the vacancy URL and runs the same server-side preview, validation, duplicate checking, and user review used by normal URL imports.
+
+## Test
+
+```sh
+node --test browser-extension/tests/*.test.mjs
+```
+
+No build or package installation is required. Zip the folder contents for store submission after adding store artwork and completing the browser-store privacy declarations.

browser-extension/background.mjs

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+import { buildCaptureUrl } from "./capture-url.mjs";
+
+const menuId = "save-vacancy-to-jobjakt";
+
+function openCapture(pageUrl) {
+  const captureUrl = buildCaptureUrl(pageUrl);
+  if (captureUrl) chrome.tabs.create({ url: captureUrl });
+}
+
+chrome.runtime.onInstalled.addListener(() => {
+  chrome.contextMenus.removeAll(() => {
+    chrome.contextMenus.create({
+      id: menuId,
+      title: "Save vacancy to Jobjakt",
+      contexts: ["page", "link"]
+    });
+  });
+});
+
+chrome.action.onClicked.addListener((tab) => openCapture(tab.url));
+chrome.contextMenus.onClicked.addListener((info, tab) => {
+  if (info.menuItemId === menuId) openCapture(info.linkUrl || info.pageUrl || tab?.url);
+});

browser-extension/capture-url.mjs

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+export const JOBBJAKT_CAPTURE_ORIGIN = "https://jobs.cesnimda.uk";
+
+export function buildCaptureUrl(pageUrl, origin = JOBBJAKT_CAPTURE_ORIGIN) {
+  let source;
+  try {
+    source = new URL(pageUrl);
+  } catch {
+    return null;
+  }
+  if (source.protocol !== "http:" && source.protocol !== "https:") return null;
+
+  const capture = new URL("/", origin);
+  capture.searchParams.set("add", source.href);
+  return capture.href;
+}

browser-extension/manifest.json

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+{
+  "manifest_version": 3,
+  "name": "Jobjakt Quick Capture",
+  "version": "1.0.0",
+  "description": "Send the current vacancy to Jobjakt's reviewed import flow.",
+  "permissions": ["activeTab", "contextMenus"],
+  "action": {
+    "default_title": "Save vacancy to Jobjakt"
+  },
+  "background": {
+    "service_worker": "background.mjs",
+    "type": "module"
+  }
+}

browser-extension/tests/capture-url.test.mjs

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+import assert from "node:assert/strict";
+import test from "node:test";
+import { buildCaptureUrl } from "../capture-url.mjs";
+
+test("builds the existing reviewed capture route", () => {
+  const result = new URL(buildCaptureUrl("https://example.test/jobs/42?from=search"));
+  assert.equal(result.origin, "https://jobs.cesnimda.uk");
+  assert.equal(result.pathname, "/");
+  assert.equal(result.searchParams.get("add"), "https://example.test/jobs/42?from=search");
+});
+
+test("rejects privileged and malformed URLs", () => {
+  assert.equal(buildCaptureUrl("chrome://settings"), null);
+  assert.equal(buildCaptureUrl("javascript:alert(1)"), null);
+  assert.equal(buildCaptureUrl("not a url"), null);
+});
+
+test("supports a local application origin during development", () => {
+  assert.equal(
+    buildCaptureUrl("https://arbeidsplassen.nav.no/stillinger/stilling/abc", "http://localhost:3300"),
+    "http://localhost:3300/?add=https%3A%2F%2Farbeidsplassen.nav.no%2Fstillinger%2Fstilling%2Fabc"
+  );
+});