PlugOS refactor and other tweaks (#631)

* Prep for in-process plug loading (e.g. for CF workers, Deno Deploy)
* Prototype of fixed in-process loading plugs
* Fix: buttons not to scroll with content
* Better positioning of modal especially on mobile
* Move query caching outside query
* Fix annoying mouse behavior when filter box appears
* Page navigator search tweaks

web/styles/editor.scss

@@ -428,12 +428,12 @@
     margin-top: 10px;
   }
 
-  .sb-markdown-top-widget:has(*) {
+  .sb-markdown-top-widget:has(*) .content {
     max-height: 500px;
   }
 
   @media screen and (max-height: 1000px) {
-    .sb-markdown-top-widget:has(*) {
+    .sb-markdown-top-widget:has(*) .content {
       max-height: 300px;
     }
   }
@@ -441,13 +441,16 @@
   .sb-markdown-widget,
   .sb-markdown-top-widget:has(*),
   .sb-markdown-bottom-widget:has(*) {
-    overflow-y: auto;
     border: 1px solid var(--editor-widget-background-color);
     border-radius: 5px;
     white-space: normal;
     position: relative;
     min-height: 48px;
 
+    .content {
+      overflow-y: auto;
+    }
+
     ul,
     ol {
       margin-top: 0;

web/styles/modals.scss

@@ -1,20 +1,16 @@
-.sb-modal-wrapper {
-  position: absolute;
-  margin: auto;
-  max-width: 500px;
-  height: 600px;
-  left: 0;
-  right: 0;
-  top: 0;
-  bottom: 0;
-  max-height: 290px;
-  z-index: 100;
-}
-
 .sb-modal-box {
+  position: absolute;
+  // At the toppest of the toppest
+  z-index: 1000;
+
+  top: 60px;
+  left: 50%;
+  transform: translateX(-50%);
+  width: 700px;
+  max-width: 90%;
+
   border-radius: 8px;
   overflow: hidden;
-  margin: 10px;
 
   .cm-content {
     padding: 0;
@@ -53,7 +49,7 @@
   }
 
   .sb-result-list {
-    max-height: 216px;
+    max-height: 250px;
     overflow-y: scroll;
 
     .sb-icon {