Extend chain creation to accept per-task description and priority

CreateChain and POST /api/widget/chains previously only took bare
title strings, with priority hardcoded to 1 -- narrower than the
spec's "an ordered list of task titles/descriptions" API line. Now
accepts []models.ChainTaskInput{Content, Description, Priority} per
position, priority defaulting to 1 when omitted.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZ7ikw2ukGJFTHE3bJS7zL

1 files changed, 11 insertions, 4 deletions

diff --git a/internal/handlers/widget.go b/internal/handlers/widget.go
index de2e856..a7f7b66 100644
--- a/internal/handlers/widget.go
+++ b/internal/handlers/widget.go
@@ -963,8 +963,8 @@ func (h *Handler) HandleWidgetLabelsBudgetTracked(w http.ResponseWriter, r *http
 }
 
 type chainCreateRequest struct {
-	Name  string   `json:"name"`
-	Tasks []string `json:"tasks"`
+	Name  string                  `json:"name"`
+	Tasks []models.ChainTaskInput `json:"tasks"`
 }
 
 type chainCreateResponse struct {
@@ -972,8 +972,9 @@ type chainCreateResponse struct {
 }
 
 // HandleWidgetChainsCreate creates a linear task chain: a backing project
-// plus one native_tasks row per title in req.Tasks, position 0 unlocked and
-// due now, the rest locked with no due date.
+// plus one native_tasks row per entry in req.Tasks (content required;
+// description and priority optional, priority defaulting to 1), position 0
+// unlocked and due now, the rest locked with no due date.
 func (h *Handler) HandleWidgetChainsCreate(w http.ResponseWriter, r *http.Request) {
 	var req chainCreateRequest
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -984,6 +985,12 @@ func (h *Handler) HandleWidgetChainsCreate(w http.ResponseWriter, r *http.Reques
 		http.Error(w, "name and at least one task are required", http.StatusBadRequest)
 		return
 	}
+	for _, t := range req.Tasks {
+		if strings.TrimSpace(t.Content) == "" {
+			http.Error(w, "every task requires non-empty content", http.StatusBadRequest)
+			return
+		}
+	}
 	chain, err := h.store.CreateChain(req.Name, req.Tasks)
 	if err != nil {
 		http.Error(w, "failed to create chain", http.StatusInternalServerError)