fix(sway/workspaces): use number when available to avoid parsing issues

[Sayrus]

Partial fix for #4741 by avoiding the name altogether. It may be possible to template using quotes if the quote type isn't present in the string, for instance:

• my workspace => "my workspace
• my "workspace" => 'my "spacespace'
• workspace's => "workspace's"

But that wouldn't cover all cases. It seems sway handles this a bit differently: it handles any string but will change parsing behavior if it encounters a keyword (output, prev, ...). This is difficult to copy and maintain without using their parsing logic instead of the quoting mechanism.

[Copilot]

Pull request overview

This PR updates the sway workspaces module to prefer switching by numeric workspace ID when available, avoiding quoting/parsing issues for workspace names containing quotes.

Changes:

• Introduces a dedicated workspace_switch_number_cmd_ format string for numeric-based workspace switching.
• Updates the click handler in Workspaces::addButton to send either a numeric-based workspace switch command when node["num"] >= 0, or fall back to the existing name-based command when no valid number is present.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/modules/sway/workspaces.cpp	Adjusts the click handler to choose between numeric and name-based workspace switch commands based on the num field, reducing quoting-related parsing issues.
include/modules/sway/workspaces.hpp	Adds a new workspace_switch_number_cmd_ format string to encapsulate the numeric workspace switch syntax.

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