[macOS 27] Bring back Writing Tools

[cyanzhong]

WKWebView in macOS Golden Gate when Siri AI is enabled, currently shows neither Writing Tools nor Ask Siri, this should be a bug.

However in iOS 27 with Siri AI enabled, Writing Tools is intentionally hidden, this might be a design change.

This changes forces showing Writing Tools, no matter with bugs or design changes.

[Copilot]

Pull request overview

This PR forces Writing Tools UI back on macOS 27 (“Golden Gate”) by injecting/bridging Writing Tools menu items (context menu, Edit menu, toolbar) even when WebKit/system behavior hides them when “Siri AI” is enabled.

Changes:

• Add a macOS 27-only helper to inject a “Show Writing Tools” item into WKWebView context menus.
• Add an Edit-menu placeholder item wired via storyboard/outlet and dynamically synchronized with the system Writing Tools menu item/submenu.
• Add localized strings and runtime tests for selector/menu item presence.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
MarkEditMac/Sources/Main/AppWritingTools.swift	Adds macOS 27 helper to ensure a Writing Tools menu item exists in a given menu.
MarkEditMac/Sources/Main/AppResources.swift	Introduces localized title for “Show Writing Tools”.
MarkEditMac/Sources/Main/Application/AppDelegate+Menu.swift	Manages hiding/showing the placeholder Writing Tools menu item and syncing submenu/title/icon.
MarkEditMac/Sources/Main/Application/AppDelegate.swift	Adds IBOutlet for the new Edit-menu Writing Tools placeholder item.
MarkEditMac/Sources/Main/AppDesign.swift	Adds forceWritingTools feature flag logic for macOS 27 based on FoundationModels availability.
MarkEditMac/Sources/Editor/Views/EditorWebView.swift	Injects “Show Writing Tools” into the WKWebView context menu when forced on macOS 27.
MarkEditMac/Sources/Editor/Controllers/EditorViewController+Toolbar.swift	Updates toolbar Writing Tools item sourcing with macOS 27 fallback.
MarkEditMac/Sources/Editor/Controllers/EditorViewController+Menu.swift	Removes now-redundant system Writing Tools menu lookup property.
MarkEditMac/Resources/Localizable.xcstrings	Adds translations for “Show Writing Tools”.
MarkEditMac/mul.lproj/Main.xcstrings	Adds non-translatable placeholder storyboard strings for the Writing Tools placeholder menu items.
MarkEditMac/Modules/Tests/RuntimeTests.swift	Adds runtime presence tests for _showWritingTools and standardWritingToolsMenuItem.
MarkEditMac/Modules/Sources/AppKitExtensions/UI/NSMenuItem+Extension.swift	Adds systemWritingToolsItem accessor via standardWritingToolsMenuItem.
MarkEditMac/Base.lproj/Main.storyboard	Adds hidden placeholder Writing Tools menu item and connects it to the AppDelegate outlet.

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[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.