feat: add MeasurementDetailScreen, 365-day charts, and edit support

- New MeasurementDetailScreen with wijzigen/verwijderen
- WeightChart now supports 30 and 365 days
- NewMeasurementScreen now handles both create and edit
- Updated README to match current code
- Add build-toolchain documentation
- Ignore *.apk build artifacts

tests/syncService.test.ts

@@ -54,4 +54,19 @@ describe('mergeMeasurements', () => {
     expect(result).toHaveLength(1)
     expect(result[0].weight).toBe(77)
   })
+
+  it('excludes ids in excludeIds from both sides', () => {
+    const local = { ...base, id: 'id-1' }
+    const remote = { ...base, id: 'id-2' }
+    const result = mergeMeasurements([local], [remote], new Set(['id-1', 'id-2']))
+    expect(result).toHaveLength(0)
+  })
+
+  it('keeps ids not in excludeIds', () => {
+    const local = { ...base, id: 'id-1' }
+    const remote = { ...base, id: 'id-2' }
+    const result = mergeMeasurements([local], [remote], new Set(['id-1']))
+    expect(result).toHaveLength(1)
+    expect(result[0].id).toBe('id-2')
+  })
 })