feat(frontend): replace all name concatenation with displayName

- Add displayName default method to PersonSummaryDTO
- Update native SQL queries to include title, person_type columns
- Add getInitials() utility to personFormat.ts
- Update abbreviateName/abbreviateCompact for nullable firstName
- Replace firstName+lastName concatenation with displayName in all
  person-displaying components and server load files
- Regenerate API types with displayName on Person and PersonSummaryDTO

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/generated/api.ts

@@ -1206,8 +1206,10 @@ export interface components {
             totalDocuments?: number;
         };
         PersonSummaryDTO: {
+            title?: string;
             /** Format: uuid */
             id?: string;
+            displayName?: string;
             firstName?: string;
             lastName?: string;
             /** Format: int32 */
@@ -1216,6 +1218,7 @@ export interface components {
             deathYear?: number;
             alias?: string;
             notes?: string;
+            personType?: string;
             /** Format: int64 */
             documentCount?: number;
         };
@@ -1231,10 +1234,10 @@ export interface components {
             /** Format: int32 */
             number?: number;
             sort?: components["schemas"]["SortObject"];
-            first?: boolean;
-            last?: boolean;
             /** Format: int32 */
             numberOfElements?: number;
+            first?: boolean;
+            last?: boolean;
             empty?: boolean;
         };
         PageableObject: {