[@mantine/dates] feat: add withWeekday and weekdayFormat props to MiniCalendar

[ishmamur-rahman-sazim]

Adds 1st feature from Feature Request #8346

Purpose

• Adds withWeekday prop to MiniCalendar to display day of the week (Mon/Tue)
• Adds weekdayFormat prop to MiniCalendar to specify dayjs format for the label

Changes

• Added above mentioned props to MiniCalendar.tsx
• Added storybook demos for both props
• Updated docs
• Added test coverage

Screenshots

[Copilot]

Pull request overview

This PR adds two new props to the MiniCalendar component to display weekday labels alongside the existing date information. The withWeekday prop enables weekday display, while weekdayFormat allows customization of the dayjs format string.

Key Changes:

• Added withWeekday boolean prop (default: false) to enable weekday label display
• Added weekdayFormat string prop (default: 'ddd') to customize weekday format
• Implemented corresponding tests, documentation, and demo examples

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/@mantine/dates/src/components/MiniCalendar/MiniCalendar.tsx	Added new props, updated types, and implemented weekday rendering logic
packages/@mantine/dates/src/components/MiniCalendar/MiniCalendar.test.tsx	Added test coverage for both new props and updated styles API selectors
packages/@mantine/dates/src/components/MiniCalendar/MiniCalendar.story.tsx	Added story examples demonstrating the new functionality
packages/@mantine/dates/src/components/MiniCalendar/MiniCalendar.module.css	Added CSS styling for the weekday label
packages/@docs/styles-api/src/data/MiniCalendar.styles-api.ts	Updated styles API documentation with new dayWeekday selector
packages/@docs/demos/src/demos/dates/MiniCalendar/index.ts	Exported new demo components
packages/@docs/demos/src/demos/dates/MiniCalendar/MiniCalendar.demos.story.tsx	Added demo stories for both props
packages/@docs/demos/src/demos/dates/MiniCalendar/MiniCalendar.demo.withWeekday.tsx	Created demo showcasing the withWeekday prop
packages/@docs/demos/src/demos/dates/MiniCalendar/MiniCalendar.demo.weekdayFormat.tsx	Created demo showcasing the weekdayFormat prop
apps/mantine.dev/src/pages/dates/mini-calendar.mdx	Added documentation sections for both new props

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Inconsistent capitalization of 'dayjs' in JSDoc comments. Line 64 uses 'Dayjs' (capitalized) for monthLabelFormat, while line 70 uses 'dayjs' (lowercase) for weekdayFormat. These should be consistent. Since the library is officially named 'Day.js' but imported as 'dayjs', using lowercase 'dayjs' would be more consistent with the actual code.

[ishmamur-rahman-sazim]

@rtivital Copilot suggests to update Dayjs to dayjs in the JSDoc comment for monthLabelFormat L:63 in MiniCalendar.tsx.
Since this is unrelated to the PR scope, is it necessary to address this now, or can we add this as part of a general documentation cleanup?