smk view sub-command

Add a sub-command to the smk command, called 'view'.
It would immediately display a map in the default browser, with no application or configuration needed.
It would allow options in the command line that mirror the options that SMK can parse in the URL.
For example:
'smk view --center=[LONG],[LAT],[ZOOM]` would open the map centered at LONG,LAT at ZOOM level.

Start by locating the smk CLI entry point and the existing code that parses SMK options from URLs. Trace how map configuration is opened or served, then define the view command's browser-launch and option-handling boundaries. Done means `smk view` opens a map without application or configuration setup and accepts URL-equivalent options such as `--center`.

Written by the indexing model from the issue text.