feat/ Nurimaze: Add auxiliary line drawing and UX improvements

[mashinosatoshi]

Nurimaze: Add auxiliary line drawing and UX improvements

This pull request introduces auxiliary line drawing functionality for the play mode of Nurimaze, along with several UI/UX refinements to enhance the solving experience.

Key Changes

1. Mouse Input Logic (mouseinput_auto)

• Drag-to-draw utility: Users can now draw auxiliary lines (connecting cell centers) by dragging from any cell.
• Toggle marker on click: Clicking (mousedown and mouseup in the same cell) still toggles the "unshaded" marker for the entire room, preserving existing behavior.
• Accurate start detection: Improved the drag detection logic to ensure the initial cell of a drag is correctly included in the line segment.

2. Automatic Logic & Constraints (Border.posthook)

• Automatic room clearing: When an auxiliary line is drawn across a border, the adjacent rooms are automatically marked as "unshaded" (clearing any black shading and setting qsub=1).
• Shading restriction: Added a safeguard to prevent rooms containing auxiliary lines from being accidentally shaded as walls.

3. Graphic Enhancements (Graphic)

• Layering adjustment: Modified the drawing order so that lines are rendered behind Start (S), Goal (G), Circle, and Triangle markers. This ensures lines appear to originate from beneath the markers.
• Subtle visual style: Changed the auxiliary line color to a soft grey (rgb(160, 160, 160)) to distinguish it from definitive puzzle elements.

Purpose

The addition of auxiliary lines allows solvers to visualize their hypothesized path from Start to Goal. These changes aim to make the solving process more intuitive and reduce accidental mis-shading in Nurimaze puzzles.

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[x-sheep]

Thank you for the pull request, but I don't think this is a good enhancement. The UX changes make it exceedingly difficult to shade multiple blocks in one motion, and this is still a shading genre at heart. I originally introduced the line drawing to only mark the path from Start to Goal, but this is not enough to finish a puzzle.