Requested Changes for Editor Knossos Implementation (#129)

* placeholder

* max length & placeholder

* Accept editor comment conflict

* integrate requested features

* null check for ref

* Change prompt for image upload

* change filter for proper input blocking

* Add spoiler button

* change url of helper link

* shallow resource link style

* resource link inherit site style

* detach preview styling from markdown-body style

* remove sizing dependance on global styles

* Bump 0.6.5

lib/assets/icons/scan-eye.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-scan-eye"><path d="M3 7V5a2 2 0 0 1 2-2h2"/><path d="M17 3h2a2 2 0 0 1 2 2v2"/><path d="M21 17v2a2 2 0 0 1-2 2h-2"/><path d="M7 21H5a2 2 0 0 1-2-2v-2"/><circle cx="12" cy="12" r="1"/><path d="M5 12s2.5-5 7-5 7 5 7 5-2.5 5-7 5-7-5-7-5"/></svg>

lib/assets/styles/classes.scss

@@ -883,7 +883,7 @@ a,
 
   a {
     cursor: pointer;
-    color: var(--color-blue);
+    color: var(--color-link);
 
     &:focus-visible,
     &:hover {