fix: guard optional objectives/technologies fields at type and render layer

src/routes/index.tsx

@@ -153,9 +153,9 @@ function ExperienceCard({
           <span>{duration}</span>
         </div>
 
-        {exp.objectives.length > 0 && (
+        {(exp.objectives ?? []).length > 0 && (
           <ul className="mb-3 ml-0 list-none space-y-1.5 p-0">
-            {exp.objectives.map((obj) => (
+            {(exp.objectives ?? []).map((obj) => (
               <li
                 key={obj.id}
                 className="flex gap-2 text-sm text-[var(--sea-ink-soft)]"
@@ -167,9 +167,9 @@ function ExperienceCard({
           </ul>
         )}
 
-        {exp.technologies.length > 0 && (
+        {(exp.technologies ?? []).length > 0 && (
           <div className="flex flex-wrap gap-1.5">
-            {exp.technologies.map((tech) => (
+            {(exp.technologies ?? []).map((tech) => (
               <TechChip key={tech.id} label={tech.name} />
             ))}
           </div>