feat: quick-capture bookmarklet

One-click job capture from any posting, reusing the existing
jobimport/preview parser.

- AddJobModal accepts initialUrl and auto-imports once on open
- App reads a /?add=<encoded url> param, opens Add Job pre-filled, and
  strips the param from the address bar
- QuickCaptureCard in Settings offers a draggable bookmarklet (href set
  via ref since React blocks javascript: URLs) plus copyable code
- EN/NB translations; README feature note
- 2 frontend tests; full suite green (22 suites / 50 tests)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

job-tracker-ui/src/components/AddJobModal.tsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useMemo, useState } from "react";
+import React, { useEffect, useMemo, useRef, useState } from "react";
 
 import { DatePicker } from "@mui/x-date-pickers/DatePicker";
 
@@ -37,6 +37,7 @@ interface Props {
   open: boolean;
   onClose: () => void;
   onCreated: () => void;
+  initialUrl?: string;
 }
 
 type DuplicateCandidate = {
@@ -97,7 +98,7 @@ function normalizeLanguage(value?: string | null) {
   return raw;
 }
 
-export default function AddJobModal({ open, onClose, onCreated }: Props) {
+export default function AddJobModal({ open, onClose, onCreated, initialUrl }: Props) {
   const { toast } = useToast();
   const { t, language } = useI18n();
 
@@ -137,6 +138,21 @@ export default function AddJobModal({ open, onClose, onCreated }: Props) {
     setCompanies(cachedCompanies);
   }, [cachedCompanies]);
 
+  // Quick-capture: when opened with a URL (from the bookmarklet), prefill and auto-import once.
+  const autoImportedUrlRef = useRef<string | null>(null);
+  useEffect(() => {
+    if (!open) {
+      autoImportedUrlRef.current = null;
+      return;
+    }
+    const url = initialUrl?.trim();
+    if (!url || autoImportedUrlRef.current === url) return;
+    autoImportedUrlRef.current = url;
+    setJobUrl(url);
+    void importFromUrl(url);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [open, initialUrl]);
+
   const resetForm = () => {
     setCompany(null);
     setCompanyInput("");
@@ -223,16 +239,17 @@ export default function AddJobModal({ open, onClose, onCreated }: Props) {
     }
   };
 
-  const importFromUrl = async () => {
+  const importFromUrl = async (urlArg?: string) => {
     if (importing) return;
-    if (!jobUrl.trim()) {
+    const url = (urlArg ?? jobUrl).trim();
+    if (!url) {
       toast(t("addJobModalPasteUrlFirst"), "warning");
       return;
     }
 
     setImporting(true);
     try {
-      const res = await api.post<JobImportResult>("/jobimport/preview", { url: jobUrl.trim() });
+      const res = await api.post<JobImportResult>("/jobimport/preview", { url });
       const r = res.data;
       if (!r?.success) throw new Error(r?.error || t("addJobModalImportFailed"));