Show a scheduled-vs-available indicator on the web timeline's Today section

Task 11 of the task-budgets-and-availability plan: reuse the
computeBudgetStatus helper (Task 8) in HandleTimeline so the dashboard's
Today section header shows scheduled/available minutes when a
budget-tracked task exists.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PQaPGQVSfmKUiHXB87qRTC

2 files changed, 44 insertions, 0 deletions

diff --git a/internal/handlers/handlers_test.go b/internal/handlers/handlers_test.go
index d16c7cf..bb383aa 100644
--- a/internal/handlers/handlers_test.go
+++ b/internal/handlers/handlers_test.go
@@ -2321,3 +2321,37 @@ func TestHandleCompleteAtom_DootShowsTitle(t *testing.T) {
 	}
 }
 
+func TestHandleTimeline_IncludesBudgetStatusWhenTrackedTaskExists(t *testing.T) {
+	h, cleanup := setupTestHandler(t)
+	defer cleanup()
+
+	project, err := h.store.CreateProject("Tracked", "#111111")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := h.store.SetProjectBudgetTracked(project.ID, true); err != nil {
+		t.Fatal(err)
+	}
+	due := time.Now()
+	if err := h.store.CreateNativeTask(models.Task{ID: "t-tracked", Content: "Tracked", ProjectID: project.ID, DueDate: &due, EstimatedMinutes: 30}); err != nil {
+		t.Fatal(err)
+	}
+
+	req := httptest.NewRequest("GET", "/tabs/timeline", nil)
+	w := httptest.NewRecorder()
+	h.HandleTimeline(w, req)
+
+	mock := h.renderer.(*MockRenderer)
+	lastCall := mock.Calls[len(mock.Calls)-1]
+	data, ok := lastCall.Data.(TimelineData)
+	if !ok {
+		t.Fatalf("expected TimelineData, got %T", lastCall.Data)
+	}
+	if data.BudgetStatus == nil {
+		t.Fatal("expected non-nil BudgetStatus")
+	}
+	if data.BudgetStatus.Today.ScheduledMinutes != 30 {
+		t.Errorf("Today.ScheduledMinutes = %d, want 30", data.BudgetStatus.Today.ScheduledMinutes)
+	}
+}
+
diff --git a/internal/handlers/timeline.go b/internal/handlers/timeline.go
index 9656d4c..9284451 100644
--- a/internal/handlers/timeline.go
+++ b/internal/handlers/timeline.go
@@ -101,6 +101,10 @@ type TimelineData struct {
 	// Current time for "now" line
 	NowHour   int
 	NowMinute int
+
+	// Opt-in budget/availability indicator for Today -- nil when no
+	// budget-tracked task exists (see computeBudgetStatus).
+	BudgetStatus *models.BudgetStatus
 }
 
 // HandleTimeline renders the timeline view
@@ -204,6 +208,12 @@ func (h *Handler) HandleTimeline(w http.ResponseWriter, r *http.Request) {
 		data.TomorrowHours = append(data.TomorrowHours, h)
 	}
 
+	budgetStatus, err := h.computeBudgetStatus(now)
+	if err != nil {
+		log.Printf("Warning: failed to compute budget status: %v", err)
+	}
+	data.BudgetStatus = budgetStatus
+
 	HTMLResponse(w, h.renderer, "timeline-tab", data)
 }