feat: warning for protected note without protection

- Use `.sn-button` everywhere
- Delete permissions modal
- Capitalize "Clear session data"

app/assets/stylesheets/_sn.scss

@@ -1,16 +0,0 @@
-/* Generic UI controls that have yet to be extracted into Stylekit  */
-
-.sn-btn {
-  @extend .border-0;
-  @extend .bg-main;
-  @extend .cursor-pointer;
-  @extend .capitalize;
-  @extend .font-bold;
-  @extend .py-2;
-  @extend .px-3;
-  @extend .rounded;
-  @extend .text-info-contrast;
-  @extend .text-sm;
-
-  @extend .hover\:brightness-130;
-}

app/assets/stylesheets/_ui.scss

@@ -81,14 +81,6 @@ $screen-md-max:              ($screen-lg-min - 1) !default;
   opacity: 0.5;
 }
 
-.flex {
-  display: flex;
-}
-
-.flex-column {
-  flex-direction: column;
-}
-
 .self-start {
   align-self: flex-start;
 }
@@ -226,6 +218,12 @@ $screen-md-max:              ($screen-lg-min - 1) !default;
 .grid-template-cols-1fr {
   grid-template-columns: 1fr;
 }
+.col-span-all {
+  grid-column: 1 / -1;
+}
+.grid-col-2 {
+  grid-column: 2;
+}
 
 .relative {
   position: relative;

app/assets/stylesheets/index.css.scss

@@ -11,4 +11,3 @@
 @import "ionicons";
 @import "reach-sub";
 @import "sessions-modal";
-@import "sn";