Added color themes (dark & light) (#148)

app/MindWork AI Studio/wwwroot/app.css

@@ -46,4 +46,12 @@
 .confidence-border > .mud-input-control-input-container > .mud-input > .mud-input-outlined-border {
     border-width: 2px;
     border-color: var(--confidence-color) !important;
+}
+
+:root {
+    --custom-icon-color: #000000;
+}
+
+.custom-icon-color > a > svg {
+    color: var(--custom-icon-color) !important;
 }

app/MindWork AI Studio/wwwroot/changelog/v0.9.11.md

@@ -1,5 +1,6 @@
 # v0.9.11, build 186 
 - Added an option to enforce a minimum confidence level throughout the entire app.
 - Added options to enforce minimum confidence levels for each assistant individually.
+- Added color themes (dark & light) to the app settings. The theme can be synchronized with the system theme.
 - Added a tooltip to the confidence card button.
 - Renamed the `Providers` enum to `LLMProviders` for better clarity. Renamed also all dependent variables and methods.