#14677 fix(control): restore #13877 group set_color/set_icon changes reverted by #14669

Summary

#14669 (ci: restore the git object seed before checkout in E2E and iOS macOS jobs, 2509187c6d9) was squashed from a stale base. Besides its workflow changes, it put three files back to their pre-#13877 state:

• CLI/cmux.swift (drops the --color / --icon aliases)
• Packages/macOS/CmuxControlSocket/.../ControlCommandCoordinator+WorkspaceGroup.swift (drops the color / icon param aliases and hex validation)
• Packages/macOS/CmuxControlSocket/Tests/.../ControlCommandCoordinatorWorkspaceGroupColorIconTests.swift (deleted)

git diff 4f0ac55da15^ 2509187c6d9 -- <those paths> is empty, so #14669 was an exact revert of #13877 for these files. No commit since touches them.

This PR restores the three files from 4f0ac55da15 (#13877) with git checkout 4f0ac55da15 -- <paths>. No other changes. #14669's CI changes stay.

Testing

Relies on PR CI (CmuxControlSocket package tests include the restored ControlCommandCoordinatorWorkspaceGroupColorIconTests). Not built locally.

🤖 Generated with Claude Code

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Summary by cubic

Restores the workspace group set_color/set_icon changes from #13877 that #14669 accidentally reverted when it was squashed from a stale base. No other changes; #14669's CI workflow changes are kept.

Restored behavior

• Re-adds the --color/--icon CLI aliases for the hex/symbol options.
• Re-adds color/icon as RPC parameter aliases, hex color validation, and normalization to the canonical #RRGGBB spelling, with invalid_params errors for malformed values.
• Re-adds the regression test suite covering aliases, clearing, and rejection of invalid inputs.

Summary by CodeRabbit

• New Features
  • Added --color and --icon as aliases for the existing color and icon options in the command-line interface.
  • Added color and icon as aliases for the corresponding workspace-group settings.
• Bug Fixes
  • Color values are validated and normalized to uppercase #RRGGBB. Invalid values and parameter types now return an error without changing settings.
  • Empty values or explicit null clear color and icon overrides.