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/App.tsx

@@ -109,6 +109,7 @@ function Shell({ jobPageSize, setJobPageSize, jobColumns, setJobColumns, themeMo
   const compactHeaderActions = useMediaQuery("(max-width:767.95px)");
 
   const [addOpen, setAddOpen] = useState(false);
+  const [captureUrl, setCaptureUrl] = useState<string | undefined>(undefined);
   const [quickOpen, setQuickOpen] = useState(false);
   const [refreshToken, setRefreshToken] = useState(0);
   const [requireAuth, setRequireAuth] = useState<boolean | null>(null);
@@ -124,6 +125,17 @@ function Shell({ jobPageSize, setJobPageSize, jobColumns, setJobColumns, themeMo
   useEffect(() => {
     api.get<AuthConfig>("/auth/config").then((r) => setRequireAuth(Boolean(r.data?.requireAuth))).catch(() => setRequireAuth(false));
   }, []);
+
+  // Quick-capture bookmarklet target: /?add=<encoded job url> opens Add Job pre-filled.
+  useEffect(() => {
+    const params = new URLSearchParams(location.search);
+    const add = params.get("add");
+    if (!add) return;
+    setCaptureUrl(add);
+    setAddOpen(true);
+    params.delete("add");
+    navigate({ pathname: location.pathname, search: params.toString() }, { replace: true });
+  }, [location.search, location.pathname, navigate]);
   useEffect(() => {
     let active = true;
     api.get<MeResponse>("/auth/me")
@@ -288,7 +300,7 @@ function Shell({ jobPageSize, setJobPageSize, jobColumns, setJobColumns, themeMo
       </AppShell>
 
       <Suspense fallback={null}>
-        <AddJobModal open={addOpen} onClose={() => setAddOpen(false)} onCreated={() => { setRefreshToken((t) => t + 1); }} />
+        <AddJobModal open={addOpen} initialUrl={captureUrl} onClose={() => { setAddOpen(false); setCaptureUrl(undefined); }} onCreated={() => { setRefreshToken((t) => t + 1); }} />
         <QuickCommandDialog open={quickOpen} onClose={() => setQuickOpen(false)} onNavigate={(to) => navigate(to)} onOpenAddJob={() => setAddOpen(true)} />
       </Suspense>
     </>