fix: land on today and swipe count habits incrementally

frontend/src/lib/mvp-utils.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest'
-import { dateKey, habitWeek, isHabitComplete, isTaskView, numericHabitInputValue, shouldToggleRowSwipe } from './mvp-utils'
+import { dateKey, defaultView, habitWeek, isHabitComplete, isTaskView, nextHabitSwipeValue, numericHabitInputValue, previousHabitSwipeValue, shouldToggleRowSwipe } from './mvp-utils'
 
 describe('MVP view utilities', () => {
   it('formats a local date as YYYY-MM-DD', () => {
@@ -29,10 +29,22 @@ describe('MVP view utilities', () => {
     expect(numericHabitInputValue(4)).toBe(4)
   })
 
-  it('toggles a row only for a deliberate right swipe', () => {
+  it('uses today as the default landing view', () => {
+    expect(defaultView()).toBe('today')
+  })
+
+  it('increments count habits one swipe at a time and caps at target', () => {
+    expect(nextHabitSwipeValue('numeric', 2, 5)).toBe(3)
+    expect(nextHabitSwipeValue('numeric', 5, 5)).toBe(5)
+    expect(previousHabitSwipeValue('numeric', 3)).toBe(2)
+    expect(previousHabitSwipeValue('numeric', 0)).toBe(0)
+  })
+
+  it('toggles a row for a deliberate mostly-horizontal swipe', () => {
     expect(shouldToggleRowSwipe(78, 8)).toBe(true)
+    expect(shouldToggleRowSwipe(88, 28)).toBe(true)
     expect(shouldToggleRowSwipe(-78, 8)).toBe(false)
     expect(shouldToggleRowSwipe(30, 2)).toBe(false)
-    expect(shouldToggleRowSwipe(80, 35)).toBe(false)
+    expect(shouldToggleRowSwipe(80, 60)).toBe(false)
   })
 })