refactor: repartition server-side and client-side code

app/.client/components/editor/icons/close.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24">
+	<path fill="currentColor" d="M13.46 12L19 17.54V19h-1.46L12 13.46L6.46 19H5v-1.46L10.54 12L5 6.46V5h1.46L12 10.54L17.54 5H19v1.46z" />
+</svg>

app/.client/components/editor/icons/loading.svg

@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24">
+	<path fill="currentColor" d="M12 4V2A10 10 0 0 0 2 12h2a8 8 0 0 1 8-8">
+        <animateTransform
+            attributeName="transform"
+            attributeType="XML"
+            type="rotate"
+            from="0 12 12"
+            to="360 12 12"
+            dur="1s"
+            repeatCount="indefinite"
+        />
+    </path>
+</svg>

app/.client/components/editor/icons/send.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24">
+	<rect width="24" height="24" fill="none" />
+	<path fill="currentColor" d="M12 2a10 10 0 0 1 10 10a10 10 0 0 1-10 10A10 10 0 0 1 2 12A10 10 0 0 1 12 2M8 7.71v3.34l7.14.95l-7.14.95v3.34L18 12z" />
+</svg>

app/.client/components/editor/icons/upload.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24">
+	<path fill="currentColor" d="M6.5 20q-2.28 0-3.89-1.57Q1 16.85 1 14.58q0-1.95 1.17-3.48q1.18-1.53 3.08-1.95q.63-2.3 2.5-3.72Q9.63 4 12 4q2.93 0 4.96 2.04Q19 8.07 19 11q1.73.2 2.86 1.5q1.14 1.28 1.14 3q0 1.88-1.31 3.19T18.5 20H13q-.82 0-1.41-.59Q11 18.83 11 18v-5.15L9.4 14.4L8 13l4-4l4 4l-1.4 1.4l-1.6-1.55V18h5.5q1.05 0 1.77-.73q.73-.72.73-1.77t-.73-1.77Q19.55 13 18.5 13H17v-2q0-2.07-1.46-3.54Q14.08 6 12 6Q9.93 6 8.46 7.46Q7 8.93 7 11h-.5q-1.45 0-2.47 1.03Q3 13.05 3 14.5T4.03 17q1.02 1 2.47 1H9v2m3-7" />
+</svg>