feat(clients): maker-checker for client edits (frontend)

- New "Pending Client Edits" screen under Checker Inbox & Tasks: server-driven pagination,
  date range + Today/Yesterday/All presets, status filter (Pending/Approved/Rejected), search —
  mirrors ChequebookRequestsComponent's architecture.
- Compare dialog diffs the maker's proposed values against a point-in-time "before" snapshot
  (client-edit-diff.util.ts) captured when the edit page was opened, so only genuinely changed
  fields show — works correctly for Pending, Approved, and Rejected edits alike, since it no
  longer depends on comparing against the live (possibly already-updated) client record.
- edit-client.component.ts: General tab save now submits for approval instead of applying
  immediately, shows a pending-approval banner, and blocks a second submission while one's
  outstanding.
- error-handler.interceptor.ts: added the new /clients/{id}/edit/pending check to the existing
  "expected 403/404, don't alert" allowlist (same pattern already used for client images/KYC).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/core/http/error-handler.interceptor.ts

@@ -54,7 +54,11 @@ export class ErrorHandlerInterceptor implements HttpInterceptor {
     const isClientImageRequest = request.url.includes('/clients/') && request.url.includes('/images');
     const isClientKycRequest = request.url.match(/\/clients\/\d+\/kyc$/);
     const isDirectorRequest = request.url.includes('/election/directors');
-    const isSilentRequest = isClientImageRequest || isClientKycRequest || isDirectorRequest;
+    // "No pending edit for this client" is the normal/expected state — checked on every edit-page
+    // load, not a real error the user needs to see.
+    const isClientPendingEditRequest = request.url.match(/\/clients\/\d+\/edit\/pending$/);
+    const isSilentRequest =
+      isClientImageRequest || isClientKycRequest || isDirectorRequest || isClientPendingEditRequest;
 
     if (!environment.production && !isSilentRequest) {
       log.error(`Request Error: ${errorMessage}`);