Fix 10 failing UI tests: kanban scroll, menu-based edit, form submit reliability

- Screens.swift: findTask() now scrolls through kanban columns (swipe left/right)
  to locate tasks rendered off-screen in LazyHGrid
- Suite5: test06/07 use refreshTasks() instead of pullToRefresh() (kanban is
  horizontal), add API call before navigate for server processing delay
- Suite6: test09 opens "Task actions" menu before tapping edit (no detail screen)
- Suite8: submitForm() uses coordinate-based keyboard dismiss, retry tap, and
  longer timeout; test22/23 re-navigate after creation and use waitForExistence

Test results: 141/143 passed (was 131/143). Remaining 2 failures are pre-existing
(Suite1 test11) and flaky/unrelated (Suite3 testR307).

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

iosApp/HoneyDueUITests/PageObjects/Screens.swift

@@ -51,7 +51,28 @@ struct TaskListScreen {
     }
 
     func findTask(title: String) -> XCUIElement {
-        app.staticTexts.containing(NSPredicate(format: "label CONTAINS %@", title)).firstMatch
+        let predicate = NSPredicate(format: "label CONTAINS %@", title)
+        let match = app.staticTexts.containing(predicate).firstMatch
+
+        // If found immediately, return
+        if match.waitForExistence(timeout: 3) { return match }
+
+        // Scroll through kanban columns (swipe left up to 6 times)
+        let scrollView = app.scrollViews.firstMatch
+        guard scrollView.exists else { return match }
+
+        for _ in 0..<6 {
+            scrollView.swipeLeft()
+            if match.waitForExistence(timeout: 1) { return match }
+        }
+
+        // Scroll back and try right direction
+        for _ in 0..<6 {
+            scrollView.swipeRight()
+            if match.waitForExistence(timeout: 1) { return match }
+        }
+
+        return match
     }
 }