Add group-scoped workspace cycle actions

[austinywang]

Closes #9137.

Summary

• Adds independently bindable nextSidebarTabInGroup and prevSidebarTabInGroup actions.
• Keeps existing Next/Previous Workspace actions window-wide.
• Resolves cycle destinations in the CmuxWorkspaces state model and runs every cycle through one TabManager selection path.
• Exposes both actions in Keyboard Shortcut Settings, cmux.json schema, and English/Japanese documentation.

Behavior

• Group-scoped cycling wraps through non-anchor members in sidebar order.
• Starting from the group anchor enters at the first/last member based on direction.
• An ungrouped focused workspace falls back to window-wide cycling.
• A group with no non-anchor member is a no-op.

Coverage

• App-level configured-shortcut routing regression coverage.
• Pure CmuxWorkspaces destination-policy coverage for both directions, anchor skipping, wraparound, ungrouped fallback, empty groups, and unchanged flat cycling.
• English and Japanese localization entries and shortcut documentation.

---

Note

Low Risk
Navigation and shortcut wiring only; existing window-wide shortcuts keep default behavior via .window scope.

Overview
Adds Next/Previous Workspace in Group shortcut actions (unbound by default) alongside the existing window-wide workspace cycling. TabManager now routes all next/prev workspace selection through a shared cycleWorkspace path that asks WorkspacesModel for a destination via new cycleDestination APIs with WorkspaceCycleScope (window vs focusedGroupMembers).

Group-scoped cycling wraps through non-anchor members in sidebar order, enters from the anchor at the first/last member, falls back to window-wide order when focus is ungrouped, and no-ops when a group has no members. Settings, dock routing, schema, web shortcut data, and EN/JA strings document the new actions; tests cover model policy and app-level shortcut routing. RestoredPanelTitleBoundaryTests is refactored for clearer intermediate expectations (no behavior change).

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📥 Commits

Reviewing files that changed from the base of the PR and between f9a29b4 and d97ba24.

📒 Files selected for processing (19)

• Packages/macOS/CmuxSettings/Sources/CmuxSettings/Values/ShortcutAction+Defaults.swift
• Packages/macOS/CmuxSettings/Sources/CmuxSettings/Values/ShortcutAction+DisplayName.swift
• Packages/macOS/CmuxSettings/Sources/CmuxSettings/Values/ShortcutAction+Group.swift
• Packages/macOS/CmuxSettings/Sources/CmuxSettings/Values/ShortcutAction.swift
• Packages/macOS/CmuxWorkspaces/Sources/CmuxWorkspaces/Model/WorkspacesModel+Cycling.swift
• Packages/macOS/CmuxWorkspaces/Sources/CmuxWorkspaces/Values/WorkspaceCycleDirection.swift
• Packages/macOS/CmuxWorkspaces/Sources/CmuxWorkspaces/Values/WorkspaceCycleScope.swift
• Packages/macOS/CmuxWorkspaces/Tests/CmuxWorkspacesTests/Session/RestoredPanelTitleBoundaryTests.swift
• Packages/macOS/CmuxWorkspaces/Tests/CmuxWorkspacesTests/WorkspaceCycleDestinationTests.swift
• Resources/Localizable.xcstrings
• Sources/AppDelegate+DockShortcutRouting.swift
• Sources/AppDelegate.swift
• Sources/KeyboardShortcutSettings.swift
• Sources/TabManager.swift
• cmux.xcodeproj/project.pbxproj
• cmuxTests/WorkspaceGroupCycleShortcutTests.swift
• skills/cmux-settings/references/shortcut-actions.md
• web/data/cmux-shortcuts.ts
• web/data/cmux.schema.json

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