Inline and lazy-load EasyMDE CSS, fix border colors (#36714)

Replace the external easymde.min.css import with an inlined and
lazy-loaded CSS file that uses proper theme variables for border colors.
All EasyMDE/CodeMirror rules are scoped under `.EasyMDEContainer`,
removing the need for !important overrides.

- Fixes easymde borders, these were broken since a while now
- Scope all easymde styles to .EasyMDEContainer
- Inline easymde.min.css and codemirror.css into web_src/css/easymde.css
- Lazy-load the CSS alongside the JS in switchToEasyMDE()
- Fix .editor-toolbar and .CodeMirror border colors to use
--color-input-border matching textarea inputs
- Remove unused gutter, line number, and other unconfigured styles
- Move .editor-loading to codeeditor.css where it belongs

<img width="891" height="518" alt="image"
src="https://github.com/user-attachments/assets/87495de5-7872-4645-90e7-96fe0f782f02"
/>

---------

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

web_src/css/codemirror/dark.css

@@ -1,106 +1,106 @@
-.CodeMirror.cm-s-default .cm-property,
-.CodeMirror.cm-s-paper .cm-property {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-property,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-property {
   color: #a0cc75;
 }
 
-.CodeMirror.cm-s-default .cm-header,
-.CodeMirror.cm-s-paper .cm-header {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-header,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-header {
   color: #9daccc;
 }
 
-.CodeMirror.cm-s-default .cm-quote,
-.CodeMirror.cm-s-paper .cm-quote {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-quote,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-quote {
   color: #009900;
 }
 
-.CodeMirror.cm-s-default .cm-keyword,
-.CodeMirror.cm-s-paper .cm-keyword {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-keyword,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-keyword {
   color: #cc8a61;
 }
 
-.CodeMirror.cm-s-default .cm-atom,
-.CodeMirror.cm-s-paper .cm-atom {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-atom,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-atom {
   color: #ef5e77;
 }
 
-.CodeMirror.cm-s-default .cm-number,
-.CodeMirror.cm-s-paper .cm-number {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-number,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-number {
   color: #ff5656;
 }
 
-.CodeMirror.cm-s-default .cm-def,
-.CodeMirror.cm-s-paper .cm-def {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-def,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-def {
   color: #e4e4e4;
 }
 
-.CodeMirror.cm-s-default .cm-variable-2,
-.CodeMirror.cm-s-paper .cm-variable-2 {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-variable-2,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-variable-2 {
   color: #00bdbf;
 }
 
-.CodeMirror.cm-s-default .cm-variable-3,
-.CodeMirror.cm-s-paper .cm-variable-3 {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-variable-3,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-variable-3 {
   color: #008855;
 }
 
-.CodeMirror.cm-s-default .cm-comment,
-.CodeMirror.cm-s-paper .cm-comment {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-comment,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-comment {
   color: #8e9ab3;
 }
 
-.CodeMirror.cm-s-default .cm-string,
-.CodeMirror.cm-s-paper .cm-string {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-string,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-string {
   color: #a77272;
 }
 
-.CodeMirror.cm-s-default .cm-string-2,
-.CodeMirror.cm-s-paper .cm-string-2 {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-string-2,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-string-2 {
   color: #ff5500;
 }
 
-.CodeMirror.cm-s-default .cm-meta,
-.CodeMirror.cm-s-paper .cm-meta,
-.CodeMirror.cm-s-default .cm-qualifier,
-.CodeMirror.cm-s-paper .cm-qualifier {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-meta,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-meta,
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-qualifier,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-qualifier {
   color: #ffb176;
 }
 
-.CodeMirror.cm-s-default .cm-builtin,
-.CodeMirror.cm-s-paper .cm-builtin {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-builtin,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-builtin {
   color: #b7c951;
 }
 
-.CodeMirror.cm-s-default .cm-bracket,
-.CodeMirror.cm-s-paper .cm-bracket {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-bracket,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-bracket {
   color: #999977;
 }
 
-.CodeMirror.cm-s-default .cm-tag,
-.CodeMirror.cm-s-paper .cm-tag {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-tag,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-tag {
   color: #f1d273;
 }
 
-.CodeMirror.cm-s-default .cm-attribute,
-.CodeMirror.cm-s-paper .cm-attribute {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-attribute,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-attribute {
   color: #bfcc70;
 }
 
-.CodeMirror.cm-s-default .cm-hr,
-.CodeMirror.cm-s-paper .cm-hr {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-hr,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-hr {
   color: #999999;
 }
 
-.CodeMirror.cm-s-default .cm-url,
-.CodeMirror.cm-s-paper .cm-url {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-url,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-url {
   color: #c5cfd0;
 }
 
-.CodeMirror.cm-s-default .cm-link,
-.CodeMirror.cm-s-paper .cm-link {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-link,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-link {
   color: #d8c792;
 }
 
-.CodeMirror.cm-s-default .cm-error,
-.CodeMirror.cm-s-paper .cm-error {
+.EasyMDEContainer .CodeMirror.cm-s-default .cm-error,
+.EasyMDEContainer .CodeMirror.cm-s-paper .cm-error {
   color: #dbdbeb;
 }