Post controls update followup (#4276)

* rm legacy repost modal

* make repost button transparent

* reduce gap between post and ctrls

* remove old repost modal on web

src/alf/atoms.ts

@@ -55,6 +55,13 @@ export const atoms = {
     height: '100vh',
   }),
 
+  /*
+   * Theme-independent bg colors
+   */
+  bg_transparent: {
+    backgroundColor: 'transparent',
+  },
+
   /*
    * Border radius
    */