refactor(eq): Enhance EQPage and luxsinApi for improved loading states and debugging

- Introduced a loading indicator for raw curve data in the EQPage to enhance user experience during data fetching.
- Added console logging for debugging purposes in luxsinApi when syncing PEQ and posting changes.
- Updated related functions to manage loading states effectively, ensuring smoother interactions.

client/src/lib/luxsinApi.ts

@@ -262,7 +262,11 @@ export class LuxsinAPI {
     const response = await fetch(`${this.baseUrl}/dev/info.cgi?action=syncPeq`);
     const text = await response.text();
     const decoded = decodeCustomBase64(text.trim());
-    return JSON.parse(decoded) as PeqState;
+    const parsed = JSON.parse(decoded) as PeqState;
+    if (import.meta.env.DEV) {
+      console.log("[syncPeq] decoded", parsed);
+    }
+    return parsed;
   }
 
   async setPeqFilters(filters: PeqFilter[]): Promise<void> {
@@ -281,6 +285,11 @@ export class LuxsinAPI {
 
   /** POST `json=<custom-base64>` — matches legacy axios `upgradePeq`. */
   private async postPeqJson(body: PeqChangePayload | PeqApplyPayload): Promise<void> {
+    if (import.meta.env.DEV) {
+      const action =
+        "peqChange" in body ? "peqChange" : "peqApply" in body ? "peqApply" : "peq";
+      console.log(`[dev/info.cgi] POST ${action}`, body);
+    }
     const encoded = encodeCustomBase64(JSON.stringify(body));
     const form = new URLSearchParams();
     form.set("json", encoded);