Custom terminal fonts support (#5414)

Fixes #5132 #5133 
- bundled 7 new monospaced fonts for terminal
- fix: refresh terminal font after changing in the preferences / keep cluster iframe accessible in DOM while not active/focused
- display terminal's custom font preview with font-name in the select-box + live-preload for current `fontSize`, fix lint

* Fixes for <Input/>:
- remove duplicated error messages for sync validators
- don't propagate invalid values on change (uncontrolled components only)
- more informative error message for numeric input with min/max info

src/renderer/template.html

@@ -1,17 +1,21 @@
 <!DOCTYPE html>
 <html lang="en">
-<head>
-  <meta charset="UTF-8">
-</head>
-<body>
-
-<div id="app"></div>
-<div id="terminal-init"></div>
-
-<div id="fonts-preloading">
-  <i class="icons"><!--material icons--></i>
-  <i class="terminal"><!--roboto mono--></i>
-</div>
-
-</body>
+  <head>
+    <meta charset="UTF-8">
+  </head>
+  <body>
+    <div id="app"></div>
+    <div id="fonts-preloading">
+      <span style="font-family: 'Material Icons'" />
+      <span style="font-family: 'RobotoMono'" />
+      <span style="font-family: 'Anonymous Pro'" />
+      <span style="font-family: 'IBM Plex Mono'" />
+      <span style="font-family: 'JetBrains Mono'" />
+      <span style="font-family: 'Red Hat Mono'" />
+      <span style="font-family: 'Source Code Pro'" />
+      <span style="font-family: 'Space Mono'" />
+      <span style="font-family: 'Ubuntu Mono'" />
+    </div>
+    <div id="terminal-init"></div>
+  </body>
 </html>