Fix timeline calendar view and shopping UI bugs (#56, #65-73)

- #56: Add overflow-hidden to card/panel classes to prevent content overflow
- #65: Fix Google Tasks not showing by including tasks without due dates
- #66: Add no-cache headers to prevent stale template responses
- #67: Increase dropdown z-index to 100 for proper layering
- #69: Implement calendar-style Today section with hourly grid (6am-10pm),
       duration-based event heights, and compact overdue/all-day section
- #70: Only reset shopping-mode form on successful submission
- #71: Remove checkboxes from shopping tab (only show in shopping mode)
- #72: Add inline add-item input at end of each store section
- #73: Add Grouped/Flat view toggle for shopping list

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/internal/api/google_tasks.go b/internal/api/google_tasks.go
index 77a00ed..ecacb6d 100644
--- a/internal/api/google_tasks.go
+++ b/internal/api/google_tasks.go
@@ -123,23 +123,26 @@ func (c *GoogleTasksClient) getTasksFromList(ctx context.Context, listID string)
 	return result, nil
 }
 
-// GetTasksByDateRange fetches tasks with due dates in the specified range
+// GetTasksByDateRange fetches tasks with due dates in the specified range.
+// Tasks without due dates are included and treated as "today" tasks.
 func (c *GoogleTasksClient) GetTasksByDateRange(ctx context.Context, start, end time.Time) ([]models.GoogleTask, error) {
 	allTasks, err := c.GetTasks(ctx)
 	if err != nil {
 		return nil, err
 	}
 
-	// Filter by date range
+	startDay := time.Date(start.Year(), start.Month(), start.Day(), 0, 0, 0, 0, c.displayTZ)
+	endDay := time.Date(end.Year(), end.Month(), end.Day(), 0, 0, 0, 0, c.displayTZ)
+
+	// Filter by date range, include tasks without due dates
 	var filtered []models.GoogleTask
 	for _, task := range allTasks {
 		if task.DueDate == nil {
+			// Include tasks without due dates (they'll be shown in "today" section)
+			filtered = append(filtered, task)
 			continue
 		}
 		dueDay := time.Date(task.DueDate.Year(), task.DueDate.Month(), task.DueDate.Day(), 0, 0, 0, 0, c.displayTZ)
-		startDay := time.Date(start.Year(), start.Month(), start.Day(), 0, 0, 0, 0, c.displayTZ)
-		endDay := time.Date(end.Year(), end.Month(), end.Day(), 0, 0, 0, 0, c.displayTZ)
-
 		if !dueDay.Before(startDay) && dueDay.Before(endDay) {
 			filtered = append(filtered, task)
 		}