Chore: Upgrade to Angular v18

Chore: Upgrade to Python 3.12
Chore: Upgrade to psycopg3

bookie/src/app/taxes/tax-detail/tax-detail.component.html

@@ -8,7 +8,7 @@
         <mat-form-field class="flex-auto">
           <mat-label>Name</mat-label>
           <input matInput #nameElement formControlName="name" (keyup.enter)="save()" />
-          <mat-hint> Format for GST: ST GST @ x% (1/2) ; CGST @ x% (1/2) </mat-hint>
+          <mat-hint> Format for GST: ST GST &#64; x% (1/2) ; CGST &#64; x% (1/2) </mat-hint>
         </mat-form-field>
       </div>
       <div class="flex flex-row justify-around content-start items-start">
@@ -22,9 +22,11 @@
         <mat-form-field class="flex-auto">
           <mat-label>Regime</mat-label>
           <mat-select formControlName="regime">
-            <mat-option *ngFor="let reg of regimes" [value]="reg.id">
-              {{ reg.name }}
-            </mat-option>
+            @for (reg of regimes; track reg) {
+              <mat-option [value]="reg.id">
+                {{ reg.name }}
+              </mat-option>
+            }
           </mat-select>
         </mat-form-field>
       </div>
@@ -32,8 +34,8 @@
   </mat-card-content>
   <mat-card-actions>
     <button mat-raised-button [disabled]="item.isFixture" color="primary" class="mr-5" (click)="save()">Save</button>
-    <button mat-raised-button [disabled]="item.isFixture" color="warn" (click)="confirmDelete()" *ngIf="!!item.id">
-      Delete
-    </button>
+    @if (!!item.id) {
+      <button mat-raised-button [disabled]="item.isFixture" color="warn" (click)="confirmDelete()">Delete</button>
+    }
   </mat-card-actions>
 </mat-card>