Move active surface between existing panes

[kyler-jh67]

Summary

• Add configurable commands for moving the active surface to the previous/next existing pane or to the pane on the left, right, above, or below.
• Route keyboard shortcuts, the command palette, and View-menu commands through TabManager into the existing Workspace.moveSurface ownership-transfer path.
• Preserve the surface instance and focus, insert after the destination pane selected tab, wrap previous/next traversal, and let Bonsplit collapse an emptied source pane.
• Reuse the same directional helper for existing tab-context-menu moves and clarify the old in-pane actions as “Reorder Surface Left/Right”.

All six new shortcut actions intentionally start unbound: the suggested Control-Command-arrow chords already belong to pane-focus actions. They remain discoverable and configurable in Settings and the command palette.

Scope

This is the focused existing-pane interaction slice (PR 1B) from the movement proposal. It does not create panes or consolidate cross-workspace/window transfer.

Verification

• swift build --package-path Packages/macOS/CmuxSettings
• scripts/lint-pbxproj-test-wiring.sh (568 test files)
• scripts/check-pbxproj.sh
• JSON validation for Resources/Localizable.xcstrings
• git diff --check
• Ad-hoc swiftc -parse over every changed Swift source and the focused test file
• ./scripts/test-unit.sh --filter MoveSurfaceBetweenPanesTests — blocked before test execution because this machine has Command Line Tools only; xcodebuild requires a full Xcode installation.
• swift test --package-path Packages/macOS/CmuxSettings — blocked because the Command Line Tools toolchain does not provide the Testing module used by the package tests.
• ./scripts/reload.sh --tag move-pane — blocked because Zig is not installed; full Xcode is also unavailable for the subsequent app build.

Test coverage added

• terminal and browser object identity/focus preservation
• insertion after the destination selected tab
• empty-source-pane collapse
• left/right/up/down movement and previous/next wrapping
• no-op behavior for missing destinations, canvas layout, and remote-tmux mirrors
• settings/default/command-palette metadata alignment

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Summary by cubic

Add commands to move the active surface between existing panes (previous/next or left/right/up/down) without creating new panes. Actions work from shortcuts, the Command Palette, and the View menu, keeping focus and surface identity, inserting after the destination’s selected tab, wrapping prev/next, and collapsing empty source panes.

• New Features

  • Six new unbound actions: move to previous/next pane; move to pane left/right/up/down.
  • Routed through TabManager into the existing Workspace.moveSurface path for consistent transfer and focus restore.
  • Command Palette commands and localized labels added; View menu entries added; beep on no destination; clears split zoom; no-ops in canvas layout and remote-tmux mirrors.

• Migration

  • New pane-move shortcuts are unbound by default; bind them in Settings.
  • In-pane actions are now labeled “Reorder Surface Left/Right”.

^{Written for commit 640a88e. Summary will update on new commits.}

Closes #8745

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[kyler-jh67]

Superseded by #8751, submitted from the preferred contributor account.