Todoist-style: priorities P1-P4, estimates, FAB add form, Today view, natural quick add, drag-and-drop with haptics

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/src/lib/haptics.ts

@@ -0,0 +1,24 @@
+// Haptics that silently no-op on web.
+import * as Haptics from "expo-haptics";
+import { Platform } from "react-native";
+
+const canBuzz = Platform.OS !== "web";
+
+export const haptic = {
+  /** Light tick — captures, small confirmations. */
+  tap: () => {
+    if (canBuzz) void Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light);
+  },
+  /** Medium thunk — picking up a draggable. */
+  pickup: () => {
+    if (canBuzz) void Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Medium);
+  },
+  /** Success notification — completing a task, landing a drop. */
+  success: () => {
+    if (canBuzz) void Haptics.notificationAsync(Haptics.NotificationFeedbackType.Success);
+  },
+  /** Selection change — flicking through chips. */
+  select: () => {
+    if (canBuzz) void Haptics.selectionAsync();
+  },
+};