feat: Add support for directional auxiliary marks (diraux) to Skyscrapers

[mashinosatoshi]

Summary

This pull request adds the ability to input and display directional arrows (diraux) on borders in the Building Puzzle (Skyscrapers). This allows solvers to mark relationships between cells, such as relative building heights, as visual aids during solving.

This PR resolves the related issue.
Fixes #696

Key Changes

• Expanded Input Modes
  • Added diraux to the play mode's inputModes, making it selectable via the toolbar.
• Implemented Mouse Input Logic
  • mouseinput_other: Enabled arrow input via dragging and clicking when in diraux mode.
  • mouseinput_auto: Enabled quick diraux input using the right mouse button in play mode.
• Updated Rendering Logic
  • Added a call to drawBorderAuxDir in Graphic.paint to ensure input marks are rendered on the grid.

Note

• Saving and loading these marks (via FileIO) is not currently implemented. Further updates to decodeBorderArrowAns and related functions would be required if data persistence for these marks is necessary.

[vercel]

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[mashinosatoshi]

I'm sorry, It's not good modification.