chore(frontend): upgrade Bootswatch and Bootstrap SCSS to v5.3.3

- Upgraded Bootswatch SCSS source files across all 25 themes (dev/scss/bootswatch/) to v5.3.3
- Upgraded Bootstrap SCSS source files (dev/scss/bootstrap/) to v5.3.3 to match static/js/bootstrap.bundle.min.js
- Updated dev/scss/bootstrap-overrides.scss to import bootstrap/variables-dark
- Verified error-free LibSass compilation for all 26 themes (25 Bootswatch + bootstrap-orj)
- Recompiled static/css/wvc-main.min.css

dev/scss/bootswatch/cyborg/_bootswatch.scss

@@ -1,4 +1,4 @@
-// Cyborg 5.2.2
+// Cyborg 5.3.3
 // Bootswatch
 
 
@@ -6,11 +6,7 @@
 
 $web-font-path: "https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap" !default;
 @if $web-font-path {
-  @import url($web-font-path);
-}
-
-:root {
-  color-scheme: dark;
+  @import url("#{$web-font-path}");
 }
 
 // Navbar
@@ -59,9 +55,6 @@ legend {
 }
 
 .form-control {
-  color-scheme: light;
-  background-clip: border-box;
-
   &:disabled,
   &[readonly] {
     border-color: transparent;
@@ -132,6 +125,11 @@ legend {
   }
 }
 
+.tooltip {
+  --bs-tooltip-bg: var(--bs-tertiary-bg);
+  --bs-tooltip-color: var(--bs-emphasis-color);
+}
+
 // Containers
 
 .list-group-item-action {

dev/scss/bootswatch/cyborg/_variables.scss

@@ -1,4 +1,4 @@
-// Cyborg 5.2.2
+// Cyborg 5.3.3
 // Bootswatch
 
 $theme: "cyborg" !default;
@@ -67,7 +67,7 @@ $table-border-color:            $gray-700 !default;
 $table-dark-bg:                 $gray-500 !default;
 $table-dark-border-color:       darken($gray-500, 7.5%) !default;
 
-$table-bg-scale:              0 !default;
+$table-bg-scale:              0% !default;
 
 // Buttons
 
@@ -89,7 +89,9 @@ $input-group-addon-border-color:    transparent !default;
 $form-check-input-bg:                     $white !default;
 $form-check-input-border:                 none !default;
 
-$form-file-button-color:          $white !default;
+$form-file-button-color:          $input-group-addon-color !default;
+$form-file-button-bg:             $input-group-addon-bg !default;
+$form-file-button-hover-bg:       darken($form-file-button-bg, 2%) !default;
 
 // Dropdowns
 
@@ -128,7 +130,6 @@ $card-bg:                           $gray-700 !default;
 
 // Tooltips
 
-$tooltip-bg:                        $gray-700 !default;
 $tooltip-opacity:                   1 !default;
 
 // Popovers