feat: sync log, cache clear endpoint, Todoist projects from cached tasks

- migration 016: sync_log table
- store: AddSyncLogEntry, GetRecentSyncLog, InvalidateAllCaches, GetProjectsFromTasks
- settings: HandleClearCache (POST /settings/clear-cache), SyncLog in page data
- settings: use GetProjectsFromTasks instead of deprecated Todoist REST /projects
- handlers: populate atom projects from store
- agent: log warning on registration failure instead of silently swallowing
- google_tasks: simplify URL literal
- tests: sync log CRUD, clear cache handler, settings page includes sync log,
  sync sources adds log entry, incremental sync paths, task completion
  response/headers, calendar cache fallback

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

1 files changed, 6 insertions, 17 deletions

diff --git a/internal/handlers/handlers.go b/internal/handlers/handlers.go
index e06c35e..4988038 100644
--- a/internal/handlers/handlers.go
+++ b/internal/handlers/handlers.go
@@ -243,16 +243,6 @@ func (h *Handler) aggregateData(ctx context.Context, forceRefresh bool) (*models
 		return err
 	})
 
-	fetch("Projects", func() error {
-		projects, err := h.todoistClient.GetProjects(ctx)
-		if err == nil {
-			mu.Lock()
-			data.Projects = projects
-			mu.Unlock()
-		}
-		return err
-	})
-
 	if h.planToEatClient != nil {
 		fetch("PlanToEat", func() error {
 			meals, err := h.fetchMeals(ctx, forceRefresh)
@@ -279,6 +269,11 @@ func (h *Handler) aggregateData(ctx context.Context, forceRefresh bool) (*models
 
 	wg.Wait()
 
+	// Populate projects from cached tasks (avoids deprecated REST API)
+	if projects, err := h.store.GetProjectsFromTasks(); err == nil {
+		data.Projects = projects
+	}
+
 	// Extract and sort Trello tasks
 	data.TrelloTasks = filterAndSortTrelloTasks(data.Boards)
 
@@ -586,7 +581,7 @@ func (h *Handler) HandleCreateTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	projects, _ := h.todoistClient.GetProjects(ctx)
+	projects, _ := h.store.GetProjectsFromTasks()
 
 	data := struct {
 		Tasks    []models.Task
@@ -772,12 +767,6 @@ func (h *Handler) getAtomDetails(id, source string) (string, *time.Time) {
 	return "Task", nil
 }
 
-// getAtomTitle retrieves the title for a task/card/bug from the store (legacy)
-func (h *Handler) getAtomTitle(id, source string) string {
-	title, _ := h.getAtomDetails(id, source)
-	return title
-}
-
 // HandleUnifiedAdd creates a task in Todoist or a card in Trello from the Quick Add form
 func (h *Handler) HandleUnifiedAdd(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()