feat(tasks): open a checker inbox entry in a popup instead of a page

Clicking a row navigated away to its own page, costing the checker the list and
whatever search they had set up. It now opens in a dialog over the list, the
same pattern the Disbursement and Closure Requests tabs already use.

ViewCheckerInboxComponent gained the optional MatDialogRef/MAT_DIALOG_DATA pair
rather than being duplicated, so the direct route still works for a bookmarked
link. Two differences follow from being a dialog:

 - the list rows carry only summary fields, so the detail (which is what has
   commandAsJson) is fetched here; by route it stays resolver-provided. The
   template reads checkerInboxDetail.* unguarded, so it is now behind an @if
   with a loading state -- otherwise a dialog would render against undefined.
 - commandAsJson is absent on some entries (a DELETE carries no payload) and
   JSON.parse(undefined) throws. By route that broke the page; in a dialog it
   would have left an empty shell open. Parsing is now guarded.

The list only reloads when something was actually actioned, since reload()
re-navigates the route and would otherwise discard the checker's search on a
plain close.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/app/tasks/checker-inbox-and-tasks-tabs/checker-inbox/checker-inbox.component.html

@@ -155,12 +155,7 @@
           <td mat-cell *matCellDef="let makerChecker">{{ makerChecker.entityName }}</td>
         </ng-container>
         <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
-        <tr
-          mat-row
-          *matRowDef="let row; columns: displayedColumns"
-          [routerLink]="[row.id, 'view']"
-          class="table-row"
-        ></tr>
+        <tr mat-row *matRowDef="let row; columns: displayedColumns" (click)="viewEntry(row)" class="table-row"></tr>
       </table>
     </div>
   }