fix: TypeScript build errors in embeds.ts and totp-settings test

- embeds.ts: non-null assert on validated octets array access
- embeds.ts: cast fetchOpts for Tauri-specific `danger` property
- totp-settings.test.ts: cast closest() result to HTMLElement for style access

Client/tauri-client/src/components/message-list/embeds.ts

@@ -94,7 +94,7 @@ function parseIPv4Literal(hostname: string): readonly [number, number, number, n
     return null;
   }
 
-  return [octets[0], octets[1], octets[2], octets[3]];
+  return [octets[0]!, octets[1]!, octets[2]!, octets[3]!];
 }
 
 function isPrivateHost(hostname: string): boolean {
@@ -178,7 +178,7 @@ function fetchOgMeta(url: string): Promise<OgMeta> {
         headers: { "User-Agent": "facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)" },
       };
       if (isTrustedServerUrl(url)) {
-        fetchOpts.danger = { acceptInvalidCerts: true, acceptInvalidHostnames: false };
+        (fetchOpts as RequestInit & { danger?: { acceptInvalidCerts: boolean; acceptInvalidHostnames: boolean } }).danger = { acceptInvalidCerts: true, acceptInvalidHostnames: false };
       }
       const res = await tauriFetch(url, fetchOpts);
       clearTimeout(timer);

Client/tauri-client/tests/unit/totp-settings.test.ts

@@ -552,7 +552,7 @@ describe("TOTP Settings", () => {
       // Disable button should reappear
       expect(disableBtn.style.display).toBe("");
       // The confirm area (parent of password input) should be hidden
-      expect(pwInput.closest("div[style*='display']")!.style.display).toBe("none");
+      expect((pwInput.closest("div[style*='display']") as HTMLElement).style.display).toBe("none");
 
       overlay.destroy?.();
     });