fix(web): facedown teardrop handles (standard Android selection fashion)

web/static/input.css

@@ -952,8 +952,11 @@
     position: fixed;
     width: 26px;
     height: 26px;
+    /* Standard Android selection teardrops: both points face DOWN toward
+       the text. The square corner is the tip — start's bottom-left corner
+       rotated -45° sits straight down; end's bottom-right +45° likewise. */
     border-radius: 50% 50% 50% 0;
-    transform: rotate(45deg);
+    transform: rotate(-45deg);
     background: #3b82f6;
     border: 2px solid #ffffff;
     box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
@@ -963,7 +966,7 @@
   }
   .adjust-handle[data-which="end"] {
     border-radius: 50% 50% 0 50%;
-    transform: rotate(-45deg);
+    transform: rotate(45deg);
   }
   .adjust-handle[data-dragging] {
     cursor: grabbing;