refactor(web): redesign httpClient with axios and unified error handling (#1061)

* fix(web): remove duplicate PasswordChecklist in error block
- Remove duplicate PasswordChecklist component from error message area
- Keep only the real-time password validation checklist
- Error block now displays only the error message text
Bug was introduced in commit aa0bd93 (PR #872)
Co-Authored-By: tinkle-community <tinklefund@gmail.com>
* refactor(web): redesign httpClient with axios and unified error handling
Major refactoring to improve error handling architecture:
## Changes
### 1. HTTP Client Redesign (httpClient.ts)
- Replaced native fetch with axios for better interceptor support
- Implemented request/response interceptors for centralized error handling
- Added automatic Bearer token injection in request interceptor
- Network errors and system errors (404, 403, 500) now intercepted and shown via toast
- Only business logic errors (4xx except 401/403/404) returned to caller
- New ApiResponse<T> interface for type-safe responses
### 2. API Migration (api.ts)
- Migrated all 31 API methods from legacy fetch-style to new httpClient
- Updated pattern: from `res.ok/res.json()` to `result.success/result.data`
- Removed getAuthHeaders() helper (token now auto-injected)
- Added TypeScript generics for better type safety
### 3. Component Updates
- AuthContext.tsx: Updated register() to use new API
- TraderConfigModal.tsx: Migrated 3 API calls (config, templates, balance)
- RegisterPage.tsx: Simplified error display (error type handling now in API layer)
### 4. Removed Legacy Code
- Removed legacyHttpClient compatibility wrapper (~30 lines)
- Removed legacyRequest() method
- Clean separation: API layer handles all error classification
## Benefits
- Centralized error handling - no need to check network/system errors in components
- Better UX - automatic toast notifications for system errors
- Type safety - generic ApiResponse<T> provides compile-time checks
- Cleaner business components - only handle business logic errors
- Consistent error messages across the application
Co-Authored-By: tinkle-community <tinklefund@gmail.com>
---------
Co-authored-by: tinkle-community <tinklefund@gmail.com>

web/src/components/RegisterPage.tsx

@@ -76,9 +76,9 @@ export function RegisterPage() {
       setQrCodeURL(result.qrCodeURL || '')
       setStep('setup-otp')
     } else {
+      // Only business errors reach here (system/network errors shown via toast)
       const msg = result.message || t('registrationFailed', language)
       setError(msg)
-      toast.error(msg)
     }
 
     setLoading(false)
@@ -298,36 +298,7 @@ export function RegisterPage() {
                     color: 'var(--binance-red)',
                   }}
                 >
-                  <div
-                    className="mb-1"
-                    style={{ color: 'var(--brand-light-gray)' }}
-                  >
-                    {t('passwordRequirements', language)}
-                  </div>
-                  <PasswordChecklist
-                    rules={[
-                      'minLength',
-                      'capital',
-                      'lowercase',
-                      'number',
-                      'specialChar',
-                      'match',
-                    ]}
-                    minLength={8}
-                    specialCharsRegex={/[@#$%!&*?]/}
-                    value={password}
-                    valueAgain={confirmPassword}
-                    messages={{
-                      minLength: t('passwordRuleMinLength', language),
-                      capital: t('passwordRuleUppercase', language),
-                      lowercase: t('passwordRuleLowercase', language),
-                      number: t('passwordRuleNumber', language),
-                      specialChar: t('passwordRuleSpecial', language),
-                      match: t('passwordRuleMatch', language),
-                    }}
-                    className="space-y-1"
-                    onChange={(isValid) => setPasswordValid(isValid)}
-                  />
+                  {error}
                 </div>
               )}