7.15.3

## What's Changed
- `[@mantine/charts]` BarChart: Fix `textColor` prop being passed down as attribute to the DOM node
- `[@mantine/core]` TypographyStylesProvider: Fix incorrect top and bottom margins of first and last elements (#7334)
- `[@mantine/core]` Transition: Fix some transitions being incompatible with headless mode (#7306)
- `[@mantine/dates]` DateTimePicker: Set milliseconds to 0 on the result date object (#7328)
- `[@mantine/dates]` Fix `hasNextLevel` prop type leak to DateTimePicker component (#7319)
- `[@mantine/core]` Avatar: Change initials function to use the full name to generate color (#7322)
- `[@mantine/hooks]` use-merged-ref: Add support for ref cleanup function in React 19 (#7304)
- `[@mantine/hooks]` use-debounced-callback: Add `flush` method to returned callback (#7272)
- `[@mantine/dates]` Improve compatibility with dayjs plugins in all components (#7302)
- `[@mantine/core]` Update peer dependencies to support React 19 (#7321)

## New Contributors
* @baravak made their first contribution in https://github.com/mantinedev/mantine/pull/7302
* @scamden made their first contribution in https://github.com/mantinedev/mantine/pull/7272
* @YukiKoNeko made their first contribution in https://github.com/mantinedev/mantine/pull/7322
* @yuki0410-dev made their first contribution in https://github.com/mantinedev/mantine/pull/7319
* @zoubingwu made their first contribution in https://github.com/mantinedev/mantine/pull/7323
* @clarknova made their first contribution in https://github.com/mantinedev/mantine/pull/7328

**Full Changelog**: https://github.com/mantinedev/mantine/compare/7.15.2...7.15.3