fix: Resolve test issues and update tasks

- Fix a11y issues in modal backdrops (keyboard handler + ARIA role)
- Increase build verification test timeouts
- Update tasks.md with current test status (157/157 passing)
- Document resolved issues #22, #23, #24

frontend/src/routes/team-members/+page.svelte

@@ -332,7 +332,7 @@
 			</div>
 		</form>
 	</div>
-	<div class="modal-backdrop" onclick={closeModal}></div>
+	<div class="modal-backdrop" onclick={closeModal} onkeydown={(e) => e.key === 'Escape' && closeModal()} role="button" tabindex="-1"></div>
 </div>
 {/if}
 
@@ -360,6 +360,6 @@
 			</button>
 		</div>
 	</div>
-	<div class="modal-backdrop" onclick={closeDeleteModal}></div>
+	<div class="modal-backdrop" onclick={closeDeleteModal} onkeydown={(e) => e.key === 'Escape' && closeDeleteModal()} role="button" tabindex="-1"></div>
 </div>
 {/if}