feat: add standalone task detail page for Android widget deep-links

Adds GET /task?id=xxx&source=xxx route that renders a full mobile-friendly
task detail page (session-protected). Widget task rows now open this page
when tapped. HandleUpdateTask redirects back to the page after a non-HTMX
save. Android: threads serverUrl through composable chain to TaskRow.

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

4 files changed, 109 insertions, 12 deletions

diff --git a/android/app/src/main/java/org/terst/doot/widget/ui/DootWidget.kt b/android/app/src/main/java/org/terst/doot/widget/ui/DootWidget.kt
index f8d8ae1..dcb73d5 100644
--- a/android/app/src/main/java/org/terst/doot/widget/ui/DootWidget.kt
+++ b/android/app/src/main/java/org/terst/doot/widget/ui/DootWidget.kt
@@ -46,9 +46,10 @@ class DootWidget : GlanceAppWidget() {
         val items = parseItems(prefs)
         val now = prefs[Keys.NOW]?.let { runCatching { Instant.parse(it) }.getOrNull() }
             ?: Instant.now()
+        val serverUrl = prefs[Keys.SERVER_URL]?.trimEnd('/') ?: ""
 
         provideContent {
-            WidgetRoot(items, now)
+            WidgetRoot(items, now, serverUrl)
         }
     }
 
@@ -59,7 +60,7 @@ class DootWidget : GlanceAppWidget() {
 }
 
 @Composable
-fun WidgetRoot(items: List<WidgetItem>, now: Instant) {
+fun WidgetRoot(items: List<WidgetItem>, now: Instant, serverUrl: String = "") {
     val zone = ZoneId.systemDefault()
     val nowZoned: ZonedDateTime = now.atZone(zone)
     val allScheduled = items.filter { it.start != null }.sortedBy { Instant.parse(it.start!!) }
@@ -89,7 +90,7 @@ fun WidgetRoot(items: List<WidgetItem>, now: Instant) {
         }
 
         for (hour in gridStart..gridEnd) {
-            HourRow(hour, nowZoned, scheduledEvents, fragments, zone)
+            HourRow(hour, nowZoned, scheduledEvents, fragments, zone, serverUrl)
         }
     }
 }
@@ -100,7 +101,8 @@ fun HourRow(
     nowZoned: ZonedDateTime,
     scheduled: List<WidgetItem>,
     fragments: List<TaskFragment>,
-    @Suppress("UNUSED_PARAMETER") zone: ZoneId
+    @Suppress("UNUSED_PARAMETER") zone: ZoneId,
+    serverUrl: String = ""
 ) {
     val hourStart = nowZoned.withHour(hour).withMinute(0).withSecond(0).withNano(0).toInstant()
     val hourEnd = hourStart.plus(1, ChronoUnit.HOURS)
@@ -147,7 +149,7 @@ fun HourRow(
             }
 
             fragsHere.forEach { frag ->
-                TaskFragmentBlock(frag)
+                TaskFragmentBlock(frag, serverUrl)
             }
         }
     }
@@ -183,7 +185,7 @@ fun EventBlock(event: WidgetItem, isPast: Boolean) {
 }
 
 @Composable
-fun TaskFragmentBlock(fragment: TaskFragment) {
+fun TaskFragmentBlock(fragment: TaskFragment, serverUrl: String = "") {
     Column(
         modifier = GlanceModifier
             .fillMaxWidth()
@@ -199,17 +201,25 @@ fun TaskFragmentBlock(fragment: TaskFragment) {
             modifier = GlanceModifier.padding(start = 8.dp, top = 3.dp, bottom = 1.dp)
         )
         fragment.slots.forEach { slot ->
-            TaskRow(slot.task)
+            TaskRow(slot.task, serverUrl)
         }
     }
 }
 
 @Composable
-fun TaskRow(task: WidgetItem) {
+fun TaskRow(task: WidgetItem, serverUrl: String = "") {
+    val tapAction = if (serverUrl.isNotEmpty()) {
+        val url = "$serverUrl/task?id=${task.id}&source=${task.source}"
+        actionStartActivity(Intent(Intent.ACTION_VIEW, Uri.parse(url)))
+    } else {
+        null
+    }
+    val rowModifier = GlanceModifier
+        .fillMaxWidth()
+        .padding(horizontal = 8.dp, vertical = 5.dp)
+        .let { if (tapAction != null) it.clickable(tapAction) else it }
     Row(
-        modifier = GlanceModifier
-            .fillMaxWidth()
-            .padding(horizontal = 8.dp, vertical = 5.dp),
+        modifier = rowModifier,
         verticalAlignment = Alignment.CenterVertically
     ) {
         if (task.completable) {
diff --git a/cmd/dashboard/main.go b/cmd/dashboard/main.go
index 133b684..92a149b 100644
--- a/cmd/dashboard/main.go
+++ b/cmd/dashboard/main.go
@@ -324,6 +324,7 @@ func main() {
 
 		// Task detail/edit
 		r.Get("/tasks/detail", h.HandleGetTaskDetail)
+		r.Get("/task", h.HandleTaskDetailPage)
 		r.Post("/tasks/update", h.HandleUpdateTask)
 
 		// Shopping quick-add
diff --git a/internal/handlers/handlers.go b/internal/handlers/handlers.go
index 19d26be..0903cf3 100644
--- a/internal/handlers/handlers.go
+++ b/internal/handlers/handlers.go
@@ -814,6 +814,58 @@ func (h *Handler) HandleGetTaskDetail(w http.ResponseWriter, r *http.Request) {
 	}{title, id, source, description})
 }
 
+// HandleTaskDetailPage renders a standalone full-page task detail view (used by Android widget deep-links).
+func (h *Handler) HandleTaskDetailPage(w http.ResponseWriter, r *http.Request) {
+	id := r.URL.Query().Get("id")
+	source := r.URL.Query().Get("source")
+
+	if id == "" || source == "" {
+		http.Error(w, "Missing id or source", http.StatusBadRequest)
+		return
+	}
+
+	var title, description string
+	switch source {
+	case "todoist":
+		if tasks, err := h.store.GetTasks(); err == nil {
+			for _, t := range tasks {
+				if t.ID == id {
+					title, description = t.Content, t.Description
+					break
+				}
+			}
+		}
+	case "trello":
+		if boards, err := h.store.GetBoards(); err == nil {
+			for _, b := range boards {
+				for _, c := range b.Cards {
+					if c.ID == id {
+						title = c.Name
+						break
+					}
+				}
+			}
+		}
+	}
+
+	if title == "" {
+		title = "Task"
+	}
+
+	data := struct {
+		Title       string
+		ID          string
+		Source      string
+		Description string
+		CSRFToken   string
+		Saved       bool
+	}{title, id, source, description, auth.GetCSRFTokenFromContext(r.Context()), r.URL.Query().Get("saved") == "1"}
+
+	if err := h.renderer.Render(w, "task-detail-page.html", data); err != nil {
+		http.Error(w, "Failed to render template", http.StatusInternalServerError)
+	}
+}
+
 // HandleUpdateTask updates a task description
 func (h *Handler) HandleUpdateTask(w http.ResponseWriter, r *http.Request) {
 	if err := r.ParseForm(); err != nil {
@@ -846,7 +898,11 @@ func (h *Handler) HandleUpdateTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	w.WriteHeader(http.StatusOK)
+	if r.Header.Get("HX-Request") != "" {
+		w.WriteHeader(http.StatusOK)
+	} else {
+		http.Redirect(w, r, "/task?id="+id+"&source="+source+"&saved=1", http.StatusSeeOther)
+	}
 }
 
 // HandleTabTasks renders the unified Tasks tab (Todoist + Trello cards with due dates + Bugs + Google Tasks)
diff --git a/web/templates/task-detail-page.html b/web/templates/task-detail-page.html
new file mode 100644
index 0000000..9bbf008
--- /dev/null
+++ b/web/templates/task-detail-page.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>{{.Title}}</title>
+    <link rel="stylesheet" href="/static/css/output.css">
+</head>
+<body class="min-h-screen bg-gray-900 text-slate-200 p-4">
+    <div class="max-w-lg mx-auto pt-6">
+        <a href="/" class="text-sm text-slate-400 hover:text-slate-200 mb-4 inline-block">&larr; Dashboard</a>
+        {{if .Saved}}<p class="text-green-400 text-sm mb-3">Saved.</p>{{end}}
+        <div class="bg-gray-800 rounded-xl p-5 mt-2">
+            <h1 class="font-semibold text-lg mb-4">{{.Title}}</h1>
+            {{if eq .Source "todoist"}}
+            <form method="post" action="/tasks/update">
+                <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
+                <input type="hidden" name="id" value="{{.ID}}">
+                <input type="hidden" name="source" value="{{.Source}}">
+                <label class="block text-sm font-medium text-slate-400 mb-1">Description</label>
+                <textarea name="description" class="w-full bg-gray-700 border border-gray-600 rounded-lg px-3 py-2 text-sm mb-4 h-32 text-slate-200">{{.Description}}</textarea>
+                <button type="submit" class="w-full bg-blue-600 hover:bg-blue-700 text-white px-4 py-2 rounded-lg text-sm font-medium">Save</button>
+            </form>
+            {{else}}
+            <p class="text-sm text-slate-400">Source: {{.Source}}</p>
+            {{end}}
+        </div>
+    </div>
+</body>
+</html>