feat: use-drawable-chars (part 1) and drop rect usage

[raphamorim]

Closes #616
Closes #974
Closes #895

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Before

After

Before

After

• Update CascadiaCode to remove Powerline since we know draw
• Should work well for different dpis
• ─ Horizontal
• │ Vertical
• ━ HeavyHorizontal
• ┃ HeavyVertical
• └ TopRight
• ┘ TopLeft
• ┌ BottomRight
• ┐ BottomLeft
• ┼ Cross
• ├ VerticalRight
• ┤ VerticalLeft
• ┬ HorizontalDown
• ┴ HorizontalUp
• ╯ ArcTopLeft
• ╭ ArcBottomRight
• ╮ ArcBottomLeft
• ╰ ArcTopRight
• ▂ LowerOneQuarterBlock
• ▁ LowerOneEighthBlock
• ┄ HorizontalLightDash
• ┅ HorizontalHeavyDash
• ┈ HorizontalLightDoubleDash
• ┉ HorizontalHeavyDoubleDash
• ╌ HorizontalLightTripleDash
• ╍ HorizontalHeavyTripleDash
• ┆ VerticalLightDash
• ┇ VerticalHeavyDash
• ┊ VerticalLightDoubleDash
• ┋ VerticalHeavyDoubleDash
• ╎ VerticalLightTripleDash
• ╏ VerticalHeavyTripleDash
• ▘ QuadrantUpperLeft
• ▝ QuadrantUpperRight
• ▖ QuadrantLowerLeft
• ▗ QuadrantLowerRight
• ▀ UpperHalf
• ▄ LowerHalf
• ▌ LeftHalf
• ▐ RightHalf
• ░ LightShade
• ▒ MediumShade
• ▓ DarkShade
• █ FullBlock
• PowerlineLeftSolid
• PowerlineRightSolid
• PowerlineLeftHollow
• PowerlineRightHollow
• PowerlineCurvedRightSolid
• PowerlineCurvedRightHollow
• PowerlineCurvedLeftSolid
• PowerlineCurvedLeftHollow

[Copilot]

Copilot reviewed 68 out of 68 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

rio-backend/src/crosswords/square.rs:187

• Verify that 'is_none_or' is supported by the minimum Rust toolchain version, as it may not be available in older versions.

&& self.extra.as_ref().is_none_or(|extra| {