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)
   })
 })

frontend/src/lib/mvp-utils.ts

@@ -24,11 +24,27 @@ export function isTaskView(view: string) {
   return view === 'tasks' || view === 'today' || view === 'upcoming'
 }
 
+export function defaultView() {
+  return 'today' as const
+}
+
 export function isHabitComplete(kind: string | undefined, value: number | boolean | undefined, target = 1) {
   if (kind === 'numeric') return Number(value ?? 0) >= target
   return Boolean(value)
 }
 
+export function nextHabitSwipeValue(kind: string | undefined, current: number | boolean | undefined, target = 1) {
+  const value = Number(current ?? 0)
+  if (kind === 'numeric') return Math.min(value + 1, target)
+  return value > 0 ? 0 : 1
+}
+
+export function previousHabitSwipeValue(kind: string | undefined, current: number | boolean | undefined) {
+  const value = Number(current ?? 0)
+  if (kind === 'numeric') return Math.max(0, value - 1)
+  return 0
+}
+
 export function numericHabitInputValue(input: number | string | undefined) {
   if (input === undefined || input === '') return null
   const value = Number(input)
@@ -36,5 +52,5 @@ export function numericHabitInputValue(input: number | string | undefined) {
 }
 
 export function shouldToggleRowSwipe(deltaX: number, deltaY: number) {
-  return deltaX >= 64 && Math.abs(deltaY) <= 24 && deltaX > Math.abs(deltaY) * 1.5
+  return deltaX >= 64 && deltaX > Math.abs(deltaY) * 1.5
 }