Make patterns puchasable with stripe (#1313)

## Description:
Patterns now show how much each skin costs and can be purchased

* Refactored logic out of TerritoryPatternsModal and into Cosmetics.ts
* Role gated cosmetics are not shown if you don't have the role. This is
to prevent people trying to get roles just for the cosmetics.
* Added purchasable cosmetics.
* On purchase the backend adds the flare to the player account

<img width="1197" alt="Screenshot 2025-07-01 at 11 45 52 AM"
src="https://github.com/user-attachments/assets/b4b4b7ea-f5f4-4c61-9ced-b608f75aa9d7"
/>

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/client/Main.ts

@@ -207,6 +207,7 @@ class Client {
       loginDiscordButton.translationKey = "main.login_discord";
       loginDiscordButton.addEventListener("click", discordLogin);
       logoutDiscordButton.hidden = true;
+      territoryModal.onUserMe(null);
     } else {
       // JWT appears to be valid
       loginDiscordButton.disable = true;
@@ -215,12 +216,12 @@ class Client {
       logoutDiscordButton.addEventListener("click", () => {
         // Log out
         logOut();
+        territoryModal.onUserMe(null);
         loginDiscordButton.disable = false;
         loginDiscordButton.translationKey = "main.login_discord";
         loginDiscordButton.hidden = false;
         loginDiscordButton.addEventListener("click", discordLogin);
         logoutDiscordButton.hidden = true;
-        territoryModal.onLogout();
       });
       // Look up the discord user object.
       // TODO: Add caching
@@ -231,6 +232,7 @@ class Client {
           loginDiscordButton.translationKey = "main.login_discord";
           loginDiscordButton.addEventListener("click", discordLogin);
           logoutDiscordButton.hidden = true;
+          territoryModal.onUserMe(null);
           return;
         }
         console.log(