Fix all static analysis errors (golangci-lint)

- Fix errcheck: handle all error return values in production code
- Fix errcheck: handle all error return values in test files
- Fix staticcheck: replace deprecated WithCredentialsFile with WithAuthCredentialsFile
- Remove unused code: authHeaders, planToEatPlannerItem, planToEatResponse
- Use defer func() { _ = x.Close() }() pattern for ignored close errors

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

1 files changed, 15 insertions, 14 deletions

diff --git a/internal/handlers/handlers.go b/internal/handlers/handlers.go
index e0e185d..a169478 100644
--- a/internal/handlers/handlers.go
+++ b/internal/handlers/handlers.go
@@ -659,9 +659,9 @@ func (h *Handler) handleAtomToggle(w http.ResponseWriter, r *http.Request, compl
 		// Remove from local cache
 		switch source {
 		case "todoist":
-			h.store.DeleteTask(id)
+			_ = h.store.DeleteTask(id)
 		case "trello":
-			h.store.DeleteCard(id)
+			_ = h.store.DeleteCard(id)
 		}
 
 		// Return completed task HTML with uncomplete option
@@ -675,9 +675,9 @@ func (h *Handler) handleAtomToggle(w http.ResponseWriter, r *http.Request, compl
 		// Invalidate cache to force refresh
 		switch source {
 		case "todoist":
-			h.store.InvalidateCache(store.CacheKeyTodoistTasks)
+			_ = h.store.InvalidateCache(store.CacheKeyTodoistTasks)
 		case "trello":
-			h.store.InvalidateCache(store.CacheKeyTrelloBoards)
+			_ = h.store.InvalidateCache(store.CacheKeyTrelloBoards)
 		}
 		// Don't swap empty response - just trigger refresh
 		w.Header().Set("HX-Reswap", "none")
@@ -710,10 +710,11 @@ func (h *Handler) getAtomTitle(id, source string) string {
 	case "bug":
 		if bugs, err := h.store.GetBugs(); err == nil {
 			var bugID int64
-			fmt.Sscanf(id, "bug-%d", &bugID)
-			for _, b := range bugs {
-				if b.ID == bugID {
-					return b.Description
+			if _, err := fmt.Sscanf(id, "bug-%d", &bugID); err == nil {
+				for _, b := range bugs {
+					if b.ID == bugID {
+						return b.Description
+					}
 				}
 			}
 		}
@@ -752,7 +753,7 @@ func (h *Handler) HandleUnifiedAdd(w http.ResponseWriter, r *http.Request) {
 			JSONError(w, http.StatusInternalServerError, "Failed to create Todoist task", err)
 			return
 		}
-		h.store.InvalidateCache(store.CacheKeyTodoistTasks)
+		_ = h.store.InvalidateCache(store.CacheKeyTodoistTasks)
 
 	case "trello":
 		listID := r.FormValue("list_id")
@@ -764,7 +765,7 @@ func (h *Handler) HandleUnifiedAdd(w http.ResponseWriter, r *http.Request) {
 			JSONError(w, http.StatusInternalServerError, "Failed to create Trello card", err)
 			return
 		}
-		h.store.InvalidateCache(store.CacheKeyTrelloBoards)
+		_ = h.store.InvalidateCache(store.CacheKeyTrelloBoards)
 
 	default:
 		JSONError(w, http.StatusBadRequest, "Invalid source", nil)
@@ -791,7 +792,7 @@ func (h *Handler) HandleGetListsOptions(w http.ResponseWriter, r *http.Request)
 
 	w.Header().Set("Content-Type", "text/html")
 	for _, list := range lists {
-		fmt.Fprintf(w, `<option value="%s">%s</option>`, list.ID, list.Name)
+		_, _ = fmt.Fprintf(w, `<option value="%s">%s</option>`, list.ID, list.Name)
 	}
 }
 
@@ -805,12 +806,12 @@ func (h *Handler) HandleGetBugs(w http.ResponseWriter, r *http.Request) {
 
 	w.Header().Set("Content-Type", "text/html")
 	if len(bugs) == 0 {
-		fmt.Fprint(w, `<p class="text-gray-500 text-sm">No bugs reported yet.</p>`)
+		_, _ = fmt.Fprint(w, `<p class="text-gray-500 text-sm">No bugs reported yet.</p>`)
 		return
 	}
 
 	for _, bug := range bugs {
-		fmt.Fprintf(w, `<div class="text-sm border-b border-gray-100 py-2">
+		_, _ = fmt.Fprintf(w, `<div class="text-sm border-b border-gray-100 py-2">
 			<p class="text-gray-900">%s</p>
 			<p class="text-gray-400 text-xs">%s</p>
 		</div>`, template.HTMLEscapeString(bug.Description), bug.CreatedAt.Format("Jan 2, 3:04 PM"))
@@ -916,7 +917,7 @@ func (h *Handler) HandleGetShoppingLists(w http.ResponseWriter, r *http.Request)
 
 	w.Header().Set("Content-Type", "text/html")
 	for _, list := range lists {
-		fmt.Fprintf(w, `<option value="%s">%s</option>`, list.ID, list.Name)
+		_, _ = fmt.Fprintf(w, `<option value="%s">%s</option>`, list.ID, list.Name)
 	}
 }