Allow aliasing built-in slash commands

Summary

It would be nice to be able to alias built-in slash commands. For example, aliasing /compact to /dream (or /snooze).

Motivation

Built-in commands like /compact are functional but not particularly evocative. Allowing users to define aliases in their settings (e.g., ~/.claude/settings.json) would let people personalize their workflow without affecting functionality.

Suggested approach

Something like:

{
  "commandAliases": {
    "dream": "compact",
    "snooze": "compact"
  }
}

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