feat(pwa): register native Android Web Share Target with dedicated /share route, explicit MIME types, and seamless note opening

public/manifest.json

@@ -44,7 +44,7 @@
     }
   ],
   "share_target": {
-    "action": "/api/hooks/note?source=share-target",
+    "action": "/share",
     "method": "POST",
     "enctype": "multipart/form-data",
     "params": {
@@ -54,7 +54,36 @@
       "files": [
         {
           "name": "files",
-          "accept": ["image/*", "audio/*", "video/*", "application/pdf", "text/*", "*/*"]
+          "accept": [
+            "text/plain",
+            "text/html",
+            "text/markdown",
+            "text/csv",
+            ".txt",
+            ".md",
+            ".html",
+            ".csv",
+            "application/pdf",
+            ".pdf",
+            "image/jpeg",
+            "image/png",
+            "image/gif",
+            "image/webp",
+            "image/*",
+            ".jpg",
+            ".jpeg",
+            ".png",
+            ".gif",
+            ".webp",
+            "audio/*",
+            ".mp3",
+            ".m4a",
+            ".wav",
+            ".ogg",
+            "video/*",
+            ".mp4",
+            ".webm"
+          ]
         }
       ]
     }