Verify flippable ruler integration

[pascalpp]

Summary

• Add integration coverage for flipped mouse labels across pixels, millimeters, and inches.
• Verify reset position uses the active zero corner and keeps default flipped rulers on a shared zero point.
• Runs the required core test command for the final flippable-ruler verification ticket.

Validation

• xcodebuild -project "Free Ruler.xcodeproj" -scheme "Free Ruler" test -only-testing:FreeRulerTests

Part of #192. Addresses #197.

[Copilot]

Pull request overview

This PR adds integration-oriented unit tests to validate the “flippable ruler” (zero-corner) feature, specifically covering mouse number label formatting across units after flips, and ensuring reset-position behavior honors the active zero corner and maintains a coherent shared corner layout (as required by issues #192 and #197).

Changes:

• Add a test ensuring mouse number labels (px/mm/in) remain correct after flipping to a non-default zero corner.
• Add tests verifying resetPosition() uses the current prefs.zeroCorner and preserves a shared zero point for flipped default layouts.

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[pascalpp]

• Verify flippable ruler integration #206 👈 (View in Graphite)
• Add flip ruler UI #205
• Handle grouped zero-corner flips #204 : 1 other dependent PR (#216 )
• Cover direction-aware resizing #203
• Update ruler drawing for zero corners #202
• Introduce zero corner geometry helpers #207
• Make rulers flippable #199 : 1 other dependent PR (#201 )
• main

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.