feat: enable Android Share Sheet for graphics & files; handle direct PDF/image clipping

public/manifest.json

@@ -47,13 +47,39 @@
     }
   ],
   "share_target": {
-    "action": "/",
-    "method": "GET",
-    "enctype": "application/x-www-form-urlencoded",
+    "action": "/share",
+    "method": "POST",
+    "enctype": "multipart/form-data",
     "params": {
       "title": "title",
       "text": "text",
-      "url": "url"
+      "url": "url",
+      "files": [
+        {
+          "name": "files",
+          "accept": [
+            "image/*",
+            "application/pdf",
+            "text/*",
+            "audio/*",
+            "video/*",
+            ".pdf",
+            ".jpg",
+            ".jpeg",
+            ".png",
+            ".webp",
+            ".gif",
+            ".svg",
+            ".enex",
+            ".md",
+            ".txt",
+            ".mp3",
+            ".m4a",
+            ".wav",
+            ".mp4"
+          ]
+        }
+      ]
     }
   },
   "shortcuts": [