Add flip ruler UI

[pascalpp]

Summary

• Wire Flip Horizontal and Flip Vertical menu items to AppDelegate actions.
• Add Shift+H and Shift+V focused-ruler hotkeys with origin-side bezel feedback.
• Localize the new bezel strings and update the Help shortcut table.

Validation

• python3 -m json.tool "Free Ruler/Localizable.xcstrings"
• xmllint --noout "Free Ruler/Base.lproj/MainMenu.xib"
• xcodebuild -project "Free Ruler.xcodeproj" -scheme "Free Ruler" test -only-testing:FreeRulerTests

Part of #192. Addresses #195.

[Copilot]

Pull request overview

This PR adds the user-facing “Flip Horizontal” / “Flip Vertical” UI wiring and introduces Shift+H / Shift+V hotkeys that flip the shared ruler zero-corner, including localized bezel feedback and updated Help documentation. It builds on the existing zero-corner model by exposing it through menu actions and focused-ruler key handling.

Changes:

• Wire “Flip Horizontal” and “Flip Vertical” menu items to new AppDelegate IBAction methods and show origin-side bezel feedback.
• Extend focused-ruler hotkey handling to accept modifier flags and support Shift+H / Shift+V flips.
• Add unit tests for the new shift-modified hotkeys and localize the new bezel strings; update the Help shortcut table.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
FreeRulerTests/RulerCoreTests.swift	Adds coverage for Shift+H / Shift+V flipping prefs.zeroCorner, plus a guard test for non-shift modifiers.
Free Ruler/RulerController.swift	Passes modifier flags into AppDelegate.performRulerHotkey(...) so shift-modified hotkeys can be handled.
Free Ruler/AppDelegate.swift	Implements flip IBActions, modifier-aware hotkey routing, and origin-side bezel messaging tied to prefs.zeroCorner.
Free Ruler/Base.lproj/MainMenu.xib	Connects the Flip menu items to the new AppDelegate actions.
Free Ruler/Localizable.xcstrings	Adds localized strings for horizontal/vertical origin bezel formats and side labels.
Free Ruler/FreeRuler.help/Contents/Resources/English.lproj/FreeRuler.html	Documents the new Shift+H / Shift+V shortcuts in the Help shortcut table.

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[pascalpp]

• Verify flippable ruler integration #206
• Add flip ruler UI #205 👈 (View in Graphite)
• 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 6 out of 6 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

FreeRulerTests/RulerCoreTests.swift:1227

• The new shift-hotkey path is sensitive to extra modifier bits (notably .capsLock when Caps Lock is enabled). Adding a test case that uses modifierFlags: [.shift, .capsLock] would prevent regressions around modifier normalization.

 let verticalController = RulerController(
ruler: Ruler(.vertical, frame: NSRect(x: 61, y: 140, width: Ruler.thickness, height: 160))
)
appDelegate.rulers = [verticalController, horizontalController]
let horizontalFrame = horizontalController.rulerWindow.frame

[pascalpp]

[codex reviewer] No findings in this incremental diff. I reviewed the menu/hotkey wiring, Shift+H/Shift+V handling including Caps Lock, bezel copy, help update, and the added unit/flip tests.