fix: the build runs under a subpath, not only at the domain root

base './' emits relative asset URLs; the manifest, the service-worker
registration and sw.js's precache resolve against their own location;
the four hardcoded /image literals turn relative. Verified headless
under a simulated /edentext/ subpath: boots, types, SW scope correct.

src/App.svelte

@@ -1130,7 +1130,7 @@
       <div class="toolbar-stack" bind:this={toolbarStackEl} style="transform: translateX(-{tbScroll}px);">
   <header class:expanded={toolbarExpanded}>
     <button class="logo-btn" onclick={() => (aboutOpen = true)} aria-label={t().about.label} title={t().about.label}>
-      <img src="/EdenText.png" alt="EdenText" class="app-logo" />
+      <img src="EdenText.png" alt="EdenText" class="app-logo" />
     </button>
     <Toolbar editor={activeEditor} tick={activeTick} onManageStyles={openStyleManager} />
     <div class="header-actions">

src/lib/components/AboutDialog.svelte

@@ -40,9 +40,9 @@
       </svg>
     </button>
 
-    <img class="icon" src="/favicon.svg" alt="" aria-hidden="true" />
+    <img class="icon" src="favicon.svg" alt="" aria-hidden="true" />
 
-    <img class="logo" src="/EdenText.png" alt="EdenText" />
+    <img class="logo" src="EdenText.png" alt="EdenText" />
 
     <p class="tagline">{t().about.tagline}</p>
 

src/lib/components/ribbon/Ribbon.svelte

@@ -330,7 +330,7 @@
     <UiLanguagePicker />
 
     <button class="rb-logo-btn" onclick={() => run(onAbout)} title={t().about.label} aria-label={t().about.label}>
-      <img src="/favicon.svg" alt="" aria-hidden="true" />
+      <img src="favicon.svg" alt="" aria-hidden="true" />
     </button>
   </div>
 

src/main.ts

@@ -19,7 +19,7 @@ window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', ()
 // build over the one being edited.
 if (import.meta.env.PROD && 'serviceWorker' in navigator) {
     window.addEventListener('load', () => {
-        navigator.serviceWorker.register('/sw.js').catch(() => {});
+        navigator.serviceWorker.register(`${import.meta.env.BASE_URL}sw.js`).catch(() => {});
     });
 }