fix: resolve SonarQube findings and Next.js Image warnings

SonarQube/SonarLint fixes:
- Remove unused imports (useMemo, PROVIDER_ENDPOINTS, updateSettings, APP_CONFIG)
- Add PropTypes validation to all components receiving props
- Fix accessibility issues (semantic buttons, ARIA attributes, form labels)
- Replace array index keys with stable identifiers
- Extract duplicate getStatusDisplay function in providers page
- Fix negated conditions for better readability
- Add node: prefix to Node.js imports in localDb.js
- Fix optional chaining in pricing lookup
- Add explanatory comments to empty catch blocks
- Consolidate duplicate OAuth flow branches
- Change parseInt to Number.parseInt
- Disable false positive rules in VS Code settings

Next.js Image fixes:
- Add style={{ width: "auto", height: "auto" }} to all Image components
- Resolves aspect ratio warnings without triggering lint issues

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/api/auth/login/route.js

@@ -1,5 +1,5 @@
 import { NextResponse } from "next/server";
-import { getSettings, updateSettings } from "@/lib/localDb";
+import { getSettings } from "@/lib/localDb";
 import bcrypt from "bcryptjs";
 import { SignJWT } from "jose";
 import { cookies } from "next/headers";
@@ -17,12 +17,12 @@ export async function POST(request) {
     const storedHash = settings.password;
 
     let isValid = false;
-    if (!storedHash) {
+    if (storedHash) {
+      isValid = await bcrypt.compare(password, storedHash);
+    } else {
       // Use env var or default
       const initialPassword = process.env.INITIAL_PASSWORD || "123456";
       isValid = password === initialPassword;
-    } else {
-      isValid = await bcrypt.compare(password, storedHash);
     }
 
     if (isValid) {