Improve vision encoder casts for WebGPU

onnx/vision_encoder.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:7aef017d0e42211e4d35f9d88bf691757c0844c9dd88ee7190e26bc3fcfb7703
-size 1453500349
+oid sha256:3579b2a9fe0e73d80a6e6152c610c80fed3739bc9e386145740ac41a0ac0dc05
+size 1453500335

onnx/vision_encoder_bnb4.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:f3e8e06be761ac08da0fb35f8cf3f2ebea3e9f2cb4a8cc08caefd2119e02fbc8
-size 294675311
+oid sha256:de1109da0797b3fc5b12858b5670179bcd2aaabfe21053c4baee39abf6221f72
+size 294675297

onnx/vision_encoder_fp16.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:1e5a26503ed487facd4459cfac85513b6c917dabd021c5ed141f283a0c7e8514
-size 727422819
+oid sha256:745a2294f62f935288a8832a344e8d4ebd5133ffbb55284a4784ab96846a4940
+size 727422805

onnx/vision_encoder_int8.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:ba1f4c8ca1fcfb0007defae0827a2528f388af79b9f000881d573796af40bb80
-size 366371735
+oid sha256:579c90e73ce8de0cf11edfb527795c4958a11d733b11aa991d0fb057aa157163
+size 366371721

onnx/vision_encoder_q4.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:dd2949cc69b4ffaaa135e813a0ede5f864a3084322565fafec95eaf17bd304e9
-size 315744349
+oid sha256:34dff602f09ee6dd50a075df84d0030400d9989bd4d603f5759e2d1c4a576408
+size 315744335

onnx/vision_encoder_quantized.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:74aa56d21ce306d559bb8ddef99cf04915c14fd9aa0452f9e39914d5a859fb4e
-size 366371812
+oid sha256:010d201de5488c8e0efb871357dc2e8ae7d372bf756d08419db6ae970ffe033e
+size 366371798

onnx/vision_encoder_uint8.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:74aa56d21ce306d559bb8ddef99cf04915c14fd9aa0452f9e39914d5a859fb4e
-size 366371812
+oid sha256:010d201de5488c8e0efb871357dc2e8ae7d372bf756d08419db6ae970ffe033e
+size 366371798