feat: Implement native file sharing with Web Share API, falling back to individual downloads.

src/views/IdeaDetailView.vue

@@ -662,18 +662,30 @@ const downloadSelected = async () => {
         const projectId = localStorage.getItem('active_project_id')
         if (projectId) headers['X-Project-ID'] = projectId
 
+        // Fetch all blobs
+        const files = []
         for (const assetId of ids) {
             const url = API_URL + '/assets/' + assetId
             const resp = await fetch(url, { headers })
             const blob = await resp.blob()
+            files.push(new File([blob], assetId + '.png', { type: blob.type || 'image/png' }))
+        }
+
+        // Try native share (iOS share sheet)
+        if (navigator.canShare && navigator.canShare({ files })) {
+            await navigator.share({ files })
+        } else {
+            // Fallback: browser download
+            for (const file of files) {
                 const a = document.createElement('a')
-            a.href = URL.createObjectURL(blob)
-            a.download = assetId + '.png'
+                a.href = URL.createObjectURL(file)
+                a.download = file.name
                 document.body.appendChild(a)
                 a.click()
                 document.body.removeChild(a)
                 URL.revokeObjectURL(a.href)
             }
+        }
         toast.add({ severity: 'success', summary: 'Downloaded', detail: `${ids.length} image(s) saved`, life: 2000 })
     } catch (e) {
         console.error('Download failed', e)