fix: prevent resume.pdf from being cached immutably

public/_headers

@@ -10,6 +10,11 @@
 /fonts2/*
   Cache-Control: public, max-age=31536000, immutable
 
+# resume.pdf changes under a stable filename, so it must revalidate
+# (unlike the hashed/never-changing assets below).
+/static/resume.pdf
+  Cache-Control: public, max-age=3600, must-revalidate
+
 /static/*
   Cache-Control: public, max-age=31536000, immutable
 

src/components/svelte/Navbar.svelte

@@ -156,7 +156,7 @@
           </div>
         {/each}
         <a
-          href="/static/resume.pdf"
+          href="/static/resume.pdf?v=2026-08"
           download
           class="flex items-center gap-2 rounded-full border border-foreground/20 px-4 py-1.5 text-sm font-medium transition-all duration-200 hover:border-foreground/40 hover:bg-foreground/5"
         >
@@ -211,7 +211,7 @@
           transition:slide={{ delay: NAV_LINKS.length * 50, duration: 200 }}
         >
           <a
-            href="/static/resume.pdf"
+            href="/static/resume.pdf?v=2026-08"
             download
             onclick={closeMobileMenu}
             class="inline-flex items-center gap-2 rounded-full border border-foreground/20 px-5 py-2 text-lg font-bold font-custom transition-all duration-200 hover:border-foreground/40 hover:bg-foreground/5"