feat: User-editable config file support (dotfile / JSON / sync to app config)

[h4ksclaw]

Summary

Add support for user-editable configuration files that sync into the app's runtime config — e.g. a dotfile (~/.obsidianirc/config.json or similar), a JSON/YAML config file, or any generic mechanism so users can version-control and edit their IRC client config outside the app UI.

Motivation

Power users want to manage their IRC configuration as text files — versioned in dotfiles repos, editable in $EDITOR, scriptable, and portable across machines. Right now if config is only editable through the in-app UI (or not externally accessible at all), users can't:

• Back up or sync config via git/stow/dotbot/etc.
• Script config generation or template it
• Share partial config snippets easily
• Migrate machines without manual re-entry

Proposed scope

• Config file path — e.g. ~/.obsidianirc/config.json or ~/.config/obsidianirc/config.yaml (XDG-compliant)
• Format — JSON (or YAML) covering: servers, channels, identities, keybinds, theme prefs, etc.
• Sync behavior — app reads file on startup (and optionally watches for changes / has a reload command)
• Write-back (optional) — option to persist current UI state back to the file
• No UI breakage — file-based config coexists with existing in-app settings; file takes precedence or merges

Example shape (JSON)

{
  "servers": {
    "Libera": {
      "host": "irc.libera.chat",
      "port": 6697,
      "tls": true,
      "nick": "mynick",
      "channels": ["#lobby", "#yourproject"]
    }
  },
  "identity": {
    "realname": "My Name",
    "user": "myuser"
  },
  "appearance": {
    "theme": "dark",
    "fontSize": 14
  }
}

Additional context

Generic use case — not tied to any particular OS or package manager. Should work on Linux, macOS, Windows, etc. equally well.

[matheusfillipe]

slop issue but I agree

[unle4rn]

Ensure XDG standards are followed instead of defaulting to the user's home dir.