fix: resolve TypeScript build errors preventing Coolify deploy

- Fix nullable location in my-jobs search filter (job.location ?? '')
- Fix Locale type assertion in jobs/new description language select
- Fix nullable location in api.ts transformApiJobToFrontend

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/app/dashboard/my-jobs/page.tsx

@@ -111,7 +111,7 @@ export default function MyJobsPage() {
         const matchesStatus = statusFilter === "all" || job.status === statusFilter
         const matchesSearch =
             job.title.toLowerCase().includes(searchTerm.toLowerCase()) ||
-            job.location.toLowerCase().includes(searchTerm.toLowerCase())
+            (job.location ?? '').toLowerCase().includes(searchTerm.toLowerCase())
         return matchesStatus && matchesSearch
     })
 

frontend/src/app/jobs/new/page.tsx

@@ -1147,7 +1147,7 @@ export default function PostJobPage() {
                       value={job.descriptionLanguage}
                       onChange={(e) => {
                         setDescriptionLanguageTouched(true);
-                        setJob({ ...job, descriptionLanguage: e.target.value });
+                        setJob({ ...job, descriptionLanguage: e.target.value as typeof job.descriptionLanguage });
                       }}
                     >
                       <option value="">{c.selectPlaceholder}</option>

frontend/src/lib/api.ts

@@ -612,7 +612,7 @@ export function transformApiJobToFrontend(apiJob: ApiJob): Job {
         id: apiJob.id,
         title: apiJob.title,
         company: apiJob.companyName || "Unknown Company",
-        location: apiJob.location,
+        location: apiJob.location ?? '',
         type: (apiJob.type as any) || "full-time",
         workMode: (apiJob.workMode as any) || "onsite",
         salary: salaryLabel,