fix(clients): stale signature bug, monthly turnover/annual income fields, senior citizen/PWD classification

- Fix signature-document reads picking the oldest upload instead of the latest across 7 call
  sites (CKYC tab, view/delete-signature dialogs, edit-wizard preview, cashier transaction entry,
  signatory service, record-master) by sorting on document id instead of an unsorted find().
- Add Monthly Turnover and Annual Income fields alongside the renamed Yearly Turnover field.
- Add Senior Citizen (auto-detected from DOB) and Person with Disability classification, with a
  required disability-certificate upload gate before client creation can proceed.
- Add Graduate and Diploma as distinct Education Levels, with diploma-specific degree options.

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

src/app/clients/client-stepper/client-general-step/client-general-step.component.html

@@ -358,6 +358,9 @@
           @if (isMinor) {
             <span class="minor-badge">Minor</span>
           }
+          @if (isSeniorCitizen) {
+            <span class="senior-citizen-badge">Senior Citizen</span>
+          }
         </div>
       }
     </div>
@@ -1217,7 +1220,38 @@
         </mat-form-field>
 
         <mat-form-field appearance="outline" class="form-field">
-          <mat-label>Annual Turnover (Last FY)</mat-label>
+          <mat-label>Annual Income</mat-label>
+          <span matPrefix class="rupee-prefix">&#8377;</span>
+          <input matInput type="number" formControlName="annualIncome" min="0" />
+          @if (
+            createClientForm.get('annualIncome')?.hasError('pattern') && createClientForm.get('annualIncome')?.touched
+          ) {
+            <mat-error>Enter a valid amount</mat-error>
+          } @else if (
+            createClientForm.get('annualIncome')?.hasError('min') && createClientForm.get('annualIncome')?.touched
+          ) {
+            <mat-error>Amount cannot be negative</mat-error>
+          }
+        </mat-form-field>
+
+        <mat-form-field appearance="outline" class="form-field">
+          <mat-label>Monthly Turnover</mat-label>
+          <span matPrefix class="rupee-prefix">&#8377;</span>
+          <input matInput type="number" formControlName="monthlyTurnover" min="0" />
+          @if (
+            createClientForm.get('monthlyTurnover')?.hasError('pattern') &&
+            createClientForm.get('monthlyTurnover')?.touched
+          ) {
+            <mat-error>Enter a valid amount</mat-error>
+          } @else if (
+            createClientForm.get('monthlyTurnover')?.hasError('min') && createClientForm.get('monthlyTurnover')?.touched
+          ) {
+            <mat-error>Amount cannot be negative</mat-error>
+          }
+        </mat-form-field>
+
+        <mat-form-field appearance="outline" class="form-field">
+          <mat-label>Yearly Turnover</mat-label>
           <span matPrefix class="rupee-prefix">&#8377;</span>
           <input matInput type="number" formControlName="annualTurnover" min="0" />
           @if (
@@ -1232,6 +1266,11 @@
           }
         </mat-form-field>
 
+        <div class="full-width subsection-title">
+          <fa-icon icon="coins" class="subsection-icon"></fa-icon>
+          Other Income
+        </div>
+
         <mat-form-field appearance="outline" class="form-field">
           <mat-label>Agriculture Income</mat-label>
           <span matPrefix class="rupee-prefix">&#8377;</span>
@@ -1265,6 +1304,76 @@
             <mat-error>Amount cannot be negative</mat-error>
           }
         </mat-form-field>
+
+        <div class="full-width subsection-title">
+          <fa-icon icon="user-shield" class="subsection-icon"></fa-icon>
+          Senior Citizen / Person with Disability
+        </div>
+
+        @if (isSeniorCitizen) {
+          <div class="full-width senior-citizen-auto-note">
+            <fa-icon icon="check-circle"></fa-icon>
+            Senior Citizen (60+ years) — detected automatically from Date of Birth
+          </div>
+
+          <div class="full-width doc-upload-field">
+            <label class="doc-upload-label">
+              <input type="file" accept=".jpg,.jpeg,.png,.pdf" hidden (change)="onSeniorCitizenProofSelected($event)" />
+              <fa-icon icon="file-upload"></fa-icon>
+              @if (seniorCitizenProofFile) {
+                <span>{{ seniorCitizenProofFile.name }}</span>
+              } @else {
+                <span>Upload Senior Citizen Proof (Age / ID Proof) &mdash; optional</span>
+              }
+            </label>
+            @if (seniorCitizenProofFile) {
+              <button type="button" mat-icon-button (click)="removeSeniorCitizenProof()" matTooltip="Remove">
+                <mat-icon>close</mat-icon>
+              </button>
+            }
+          </div>
+        }
+
+        <div class="checkbox-field full-width">
+          <mat-checkbox formControlName="isPwd">Person with Disability (PWD)</mat-checkbox>
+        </div>
+
+        @if (createClientForm.get('isPwd')?.value) {
+          <mat-form-field appearance="outline" class="form-field">
+            <mat-label>Disability Type</mat-label>
+            <mat-select formControlName="pwdCategoryId">
+              @for (category of pwdCategoryOptions; track category.id) {
+                <mat-option [value]="category.id">{{ category.name }}</mat-option>
+              }
+            </mat-select>
+            @if (seniorPwdDocsTouched && !createClientForm.get('pwdCategoryId')?.value) {
+              <mat-error>Disability type is required</mat-error>
+            }
+          </mat-form-field>
+
+          <div class="full-width doc-upload-field">
+            <label
+              class="doc-upload-label"
+              [class.doc-upload-label--missing]="seniorPwdDocsTouched && !pwdCertificateFile"
+            >
+              <input type="file" accept=".jpg,.jpeg,.png,.pdf" hidden (change)="onPwdCertificateSelected($event)" />
+              <fa-icon icon="file-upload"></fa-icon>
+              @if (pwdCertificateFile) {
+                <span>{{ pwdCertificateFile.name }}</span>
+              } @else {
+                <span>Upload Disability Certificate <span class="doc-upload-req">*</span></span>
+              }
+            </label>
+            @if (pwdCertificateFile) {
+              <button type="button" mat-icon-button (click)="removePwdCertificate()" matTooltip="Remove">
+                <mat-icon>close</mat-icon>
+              </button>
+            }
+            @if (seniorPwdDocsTouched && !pwdCertificateFile) {
+              <span class="doc-upload-error">Required when PWD is checked</span>
+            }
+          </div>
+        }
       </div>
     </div>
   }