feat: unify Google Tasks with main system via caching and integrated UI

- Implement SQLite caching layer for Google Tasks
- Integrate Google Tasks into unified Atoms loop (showing in Tasks tab)
- Update Planning tab to include cached Google Tasks
- Enhance Quick Add form with Todoist project selector
- Remove orphaned HandleTasksTab/HandleRefreshTab methods
- Update tests to reflect new BuildTimeline signature and data structures

1 files changed, 107 insertions, 2 deletions

diff --git a/internal/store/sqlite.go b/internal/store/sqlite.go
index 3879395..f9c9a6b 100644
--- a/internal/store/sqlite.go
+++ b/internal/store/sqlite.go
@@ -23,6 +23,7 @@ const (
 	CacheKeyTrelloBoards      = "trello_boards"
 	CacheKeyPlanToEatMeals    = "plantoeat_meals"
 	CacheKeyGoogleCalendar    = "google_calendar"
+	CacheKeyGoogleTasks       = "google_tasks"
 )
 
 type Store struct {
@@ -867,6 +868,110 @@ func (s *Store) GetCalendarEventsByDateRange(start, end time.Time) ([]models.Cal
 	return events, rows.Err()
 }
 
+// Google Tasks operations
+
+// SaveGoogleTasks replaces all cached Google Tasks
+func (s *Store) SaveGoogleTasks(tasks []models.GoogleTask) error {
+	tx, err := s.db.Begin()
+	if err != nil {
+		return err
+	}
+	defer func() { _ = tx.Rollback() }()
+
+	if _, err := tx.Exec(`DELETE FROM google_tasks`); err != nil {
+		return err
+	}
+
+	stmt, err := tx.Prepare(`
+		INSERT INTO google_tasks (id, title, notes, status, completed, due_date, updated_at, list_id, url)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+	`)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = stmt.Close() }()
+
+	for _, t := range tasks {
+		_, err = stmt.Exec(t.ID, t.Title, t.Notes, t.Status, t.Completed, t.DueDate, t.UpdatedAt, t.ListID, t.URL)
+		if err != nil {
+			return err
+		}
+	}
+
+	return tx.Commit()
+}
+
+// GetGoogleTasks retrieves all cached Google Tasks
+func (s *Store) GetGoogleTasks() ([]models.GoogleTask, error) {
+	rows, err := s.db.Query(`
+		SELECT id, title, notes, status, completed, due_date, updated_at, list_id, url
+		FROM google_tasks
+		ORDER BY completed ASC, CASE WHEN due_date IS NULL THEN 1 ELSE 0 END, due_date ASC
+	`)
+	if err != nil {
+		return nil, err
+	}
+	defer func() { _ = rows.Close() }()
+
+	var tasks []models.GoogleTask
+	for rows.Next() {
+		var t models.GoogleTask
+		var dueDate, updatedAt sql.NullTime
+
+		err := rows.Scan(&t.ID, &t.Title, &t.Notes, &t.Status, &t.Completed, &dueDate, &updatedAt, &t.ListID, &t.URL)
+		if err != nil {
+			return nil, err
+		}
+
+		if dueDate.Valid {
+			t.DueDate = &dueDate.Time
+		}
+		if updatedAt.Valid {
+			t.UpdatedAt = updatedAt.Time
+		}
+
+		tasks = append(tasks, t)
+	}
+
+	return tasks, rows.Err()
+}
+
+// GetGoogleTasksByDateRange retrieves cached Google Tasks in a date range
+func (s *Store) GetGoogleTasksByDateRange(start, end time.Time) ([]models.GoogleTask, error) {
+	rows, err := s.db.Query(`
+		SELECT id, title, notes, status, completed, due_date, updated_at, list_id, url
+		FROM google_tasks
+		WHERE due_date IS NULL OR (due_date >= ? AND due_date < ?)
+		ORDER BY completed ASC, CASE WHEN due_date IS NULL THEN 1 ELSE 0 END, due_date ASC
+	`, start, end)
+	if err != nil {
+		return nil, err
+	}
+	defer func() { _ = rows.Close() }()
+
+	var tasks []models.GoogleTask
+	for rows.Next() {
+		var t models.GoogleTask
+		var dueDate, updatedAt sql.NullTime
+
+		err := rows.Scan(&t.ID, &t.Title, &t.Notes, &t.Status, &t.Completed, &dueDate, &updatedAt, &t.ListID, &t.URL)
+		if err != nil {
+			return nil, err
+		}
+
+		if dueDate.Valid {
+			t.DueDate = &dueDate.Time
+		}
+		if updatedAt.Valid {
+			t.UpdatedAt = updatedAt.Time
+		}
+
+		tasks = append(tasks, t)
+	}
+
+	return tasks, rows.Err()
+}
+
 // Agent operations
 
 // CreateAgentSession creates a new pending agent session
@@ -1403,8 +1508,8 @@ func (s *Store) SyncSourceConfigs(source, itemType string, items []models.Source
 
 // InvalidateAllCaches removes cache metadata for all known cache keys
 func (s *Store) InvalidateAllCaches() error {
-	_, err := s.db.Exec(`DELETE FROM cache_metadata WHERE key IN (?, ?, ?, ?)`,
-		CacheKeyTodoistTasks, CacheKeyTrelloBoards, CacheKeyPlanToEatMeals, CacheKeyGoogleCalendar)
+	_, err := s.db.Exec(`DELETE FROM cache_metadata WHERE key IN (?, ?, ?, ?, ?)`,
+		CacheKeyTodoistTasks, CacheKeyTrelloBoards, CacheKeyPlanToEatMeals, CacheKeyGoogleCalendar, CacheKeyGoogleTasks)
 	return err
 }