fix(clipboard): use navigator.clipboard.writeText as primary, arboard as fallback — fixes silent failure on Linux/XWayland

src/lib/pages/DictationPage.svelte

@@ -417,7 +417,9 @@
   async function finaliseTranscription(audioPath = null) {
     if (transcript.trim()) {
       if (settings.autoCopy) {
-        invoke("copy_to_clipboard", { text: transcript }).catch(() => {});
+        navigator.clipboard.writeText(transcript).catch(() => {
+          invoke("copy_to_clipboard", { text: transcript }).catch(() => {});
+        });
       }
 
       const historyId = crypto.randomUUID();
@@ -464,7 +466,11 @@
   }
 
   function copyAll() {
-    if (transcript) invoke("copy_to_clipboard", { text: transcript }).catch(() => {});
+    if (transcript) {
+      navigator.clipboard.writeText(transcript).catch(() => {
+        invoke("copy_to_clipboard", { text: transcript }).catch(() => {});
+      });
+    }
   }
 
   function clearTranscript() {

src/lib/pages/FilesPage.svelte

@@ -118,7 +118,11 @@
   }
 
   function copyAll() {
-    if (fileTranscript) invoke("copy_to_clipboard", { text: fileTranscript }).catch(() => {});
+    if (fileTranscript) {
+      navigator.clipboard.writeText(fileTranscript).catch(() => {
+        invoke("copy_to_clipboard", { text: fileTranscript }).catch(() => {});
+      });
+    }
   }
 
   function handleExport(format) {

src/lib/pages/HistoryPage.svelte

@@ -178,7 +178,9 @@
   }
 
   function copyItem(item) {
-    invoke("copy_to_clipboard", { text: item.text }).catch(() => {});
+    navigator.clipboard.writeText(item.text).catch(() => {
+      invoke("copy_to_clipboard", { text: item.text }).catch(() => {});
+    });
   }
 
   function removeItem(item) {

src/routes/viewer/+page.svelte

@@ -194,7 +194,10 @@
 
   function copySegment(idx) {
     if (item?.segments?.[idx]) {
-      invoke("copy_to_clipboard", { text: item.segments[idx].text.trim() }).catch(() => {});
+      const text = item.segments[idx].text.trim();
+      navigator.clipboard.writeText(text).catch(() => {
+        invoke("copy_to_clipboard", { text }).catch(() => {});
+      });
     }
   }