feat(theme): added pale_nimbus (@conner-mcnicholas) (#7055)

# Description

Created a new theme "pale_nimbus" per instructions.

## Screenshots
 
####  ------Normal Test------
<img width="1244" height="1170" alt="test"
src="https://github.com/user-attachments/assets/9b74bf69-6202-4dde-b011-fa8cea48168a"
/>

####  ------Flipped Test------
<img width="1242" height="1172" alt="flip"
src="https://github.com/user-attachments/assets/589ee12a-ce34-4688-beb3-9f43fe147450"
/>

####  ------Colorful Test------
<img width="1244" height="1170" alt="colorful"
src="https://github.com/user-attachments/assets/7079fc55-461d-4355-a9c8-eeede747f4f8"
/>

####  ------Flipped and Colorful Test------
<img width="1240" height="1166" alt="flip_colorful"
src="https://github.com/user-attachments/assets/30ac5c08-b2cb-4481-99ff-65f6dc4ab77f"
/>

####  ------Settings------
<img width="1238" height="1170" alt="menu"
src="https://github.com/user-attachments/assets/d7818bf0-02af-4433-b6ba-487a426dace1"
/>

####  ------Stats------
<img width="928" height="1156" alt="stats"
src="https://github.com/user-attachments/assets/cef260af-858b-45b3-837b-121c538d450c"
/>

frontend/src/ts/constants/themes.ts

@@ -1114,6 +1114,12 @@ export const themes: Record<ThemeName, Omit<Theme, "name">> = {
     subColor: "#5b578e",
     textColor: "#f4e0c9",
   },
+  pale_nimbus: {
+    bgColor: "#433e4c",
+    mainColor: "#94ffc2",
+    subColor: "#ffaca3",
+    textColor: "#feffdb",
+  },
 };
 
 export const ThemesList: Theme[] = Object.keys(themes)

frontend/static/themes/pale_nimbus.css

@@ -0,0 +1,12 @@
+:root {
+  --bg-color: #433e4c;
+  --main-color: #94ffc2;
+  --caret-color: #9efffd;
+  --sub-color: #ffaca3;
+  --sub-alt-color: #694f5e;
+  --text-color: #feffdb;
+  --error-color: #ff5c5c;
+  --error-extra-color: #ff0000;
+  --colorful-error-color: #ff3874;
+  --colorful-error-extra-color: #c2386f;
+}

packages/schemas/src/themes.ts

@@ -187,6 +187,7 @@ export const ThemeNameSchema = z.enum(
     "watermelon",
     "wavez",
     "witch_girl",
+    "pale_nimbus",
   ],
   {
     errorMap: customEnumErrorHandler("Must be a known theme"),