feat(layout): add miligram layout (@kazeno-uta)

[kazeno-uta]

Description

added miligram layout, made by me, inspired by engram

Checks

• Adding quotes?
  • Make sure to include translations for the quotes in the description (or another comment) so we can verify their content.
• Adding a language?
  • Make sure to follow the languages documentation
  • Add language to packages/schemas/src/languages.ts
  • Add language to exactly one group in frontend/src/ts/constants/languages.ts
  • Add language json file to frontend/static/languages
• Adding a theme?
  • Make sure to follow the themes documentation
  • Add theme to packages/schemas/src/themes.ts
  • Add theme to frontend/src/ts/constants/themes.ts
  • (optional) Add theme css file to frontend/static/themes
  • Add some screenshots of the theme, especially with different test settings (colorful, flip colors) to your pull request
• Adding a layout?
  • Make sure to follow the layouts documentation
  • Add layout to packages/schemas/src/layouts.ts
  • Add layout json file to frontend/static/layouts
• Adding a font?
  • Make sure to follow the fonts documentation
  • Add font file to frontend/static/webfonts
  • Add font to packages/schemas/src/fonts.ts
  • Add font to frontend/src/ts/constants/fonts.ts
• Check if any open issues are related to this PR; if so, be sure to tag them below.
• Make sure the PR title follows the Conventional Commits standard. (https://www.conventionalcommits.org for more info)
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Closes #

[Copilot]

Pull request overview

This PR adds a new keyboard layout called "miligram", inspired by the engram layout. The layout is configured as an ISO layout with the top row always visible.

Changes:

• Added "miligram" to the layout schema enum
• Created miligram.json layout file with key mappings for an ISO keyboard

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
packages/schemas/src/layouts.ts	Added "miligram" to the LayoutNameSchema enum
frontend/static/layouts/miligram.json	New layout file defining key mappings for the miligram ISO layout

[github-actions]

Continuous integration check(s) failed. Please review the failing check's logs and make the necessary changes.