Add task title editing/deletion, timeline click-to-open, widget app launch

Task-detail modal was description-only with no delete affordance;
HandleUpdateTask now saves the title too and a Delete button hits a new
DELETE /tasks/{id} route backed by store.DeleteNativeTask, which repairs
chain_position/unlocks the successor when the deleted task belongs to a
chain. Timeline tab task/card/gtask rows now open the same detail modal
as the Tasks tab. Android widget's "TODAY" header is now a tap target
that launches DashboardActivity, since nothing previously opened the
full app from the widget.

1 files changed, 41 insertions, 2 deletions

diff --git a/internal/handlers/handlers.go b/internal/handlers/handlers.go
index ed15e89..30aaf67 100644
--- a/internal/handlers/handlers.go
+++ b/internal/handlers/handlers.go
@@ -15,6 +15,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/go-chi/chi/v5"
+
 	"task-dashboard/internal/api"
 	"task-dashboard/internal/auth"
 	"task-dashboard/internal/config"
@@ -951,6 +953,7 @@ func (h *Handler) HandleUpdateTask(w http.ResponseWriter, r *http.Request) {
 
 	id := r.FormValue("id")
 	source := r.FormValue("source")
+	title := r.FormValue("title")
 	description := r.FormValue("description")
 
 	if id == "" || source == "" {
@@ -961,9 +964,17 @@ func (h *Handler) HandleUpdateTask(w http.ResponseWriter, r *http.Request) {
 	var err error
 	switch source {
 	case "doot":
-		err = h.store.UpdateNativeTaskDescription(id, description)
+		if title != "" {
+			err = h.store.UpdateNativeTask(id, title, description)
+		} else {
+			err = h.store.UpdateNativeTaskDescription(id, description)
+		}
 	case "trello":
-		err = h.trelloClient.UpdateCard(r.Context(), id, map[string]interface{}{"desc": description})
+		updates := map[string]interface{}{"desc": description}
+		if title != "" {
+			updates["name"] = title
+		}
+		err = h.trelloClient.UpdateCard(r.Context(), id, updates)
 	default:
 		JSONError(w, http.StatusBadRequest, "Unknown source", nil)
 		return
@@ -981,6 +992,34 @@ func (h *Handler) HandleUpdateTask(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+// HandleDeleteTask permanently deletes a doot-native task. Other sources
+// (Trello cards, Google Tasks, calendar events) aren't deletable through
+// doot -- the task-detail modal only shows the Delete button for source ==
+// "doot" (task-detail.html's IsDoot flag), matching this scoping.
+func (h *Handler) HandleDeleteTask(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	source := r.URL.Query().Get("source")
+	if id == "" {
+		JSONError(w, http.StatusBadRequest, "Missing id", nil)
+		return
+	}
+	if source != "doot" {
+		JSONError(w, http.StatusBadRequest, "Delete is only supported for doot-native tasks", nil)
+		return
+	}
+
+	if err := h.store.DeleteNativeTask(id); err != nil {
+		if errors.Is(err, store.ErrNativeTaskNotFound) {
+			JSONError(w, http.StatusNotFound, "task not found", err)
+			return
+		}
+		JSONError(w, http.StatusInternalServerError, "Failed to delete task", err)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+}
+
 // HandleTabTasks renders the unified Tasks tab (native tasks + Trello cards with due dates + Google Tasks)
 func (h *Handler) HandleTabTasks(w http.ResponseWriter, r *http.Request) {
 	atoms, boards, err := BuildUnifiedAtomList(h.store, h.claudomatorClient)