Make clan tag warning clickable (#4163)

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**Add approved & assigned issue number here:**

Resolves #4154

## Description:

Adds a join path from reserved clan tag warnings to the clan detail
modal.


https://github.com/user-attachments/assets/cc0f4cb8-be8e-414a-8147-7a744069999e


## 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

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

aotumuri

src/client/components/clan/ClanDetailView.ts

@@ -254,6 +254,9 @@ export class ClanDetailView extends LitElement {
     try {
       const result = await joinClan(this.selectedClan.tag);
       if ("error" in result) {
+        if (result.error === "clan_modal.sign_in_for_clans") {
+          window.showPage?.("page-account");
+        }
         showToast(
           result.reason
             ? translateText(result.error, { reason: result.reason })