Support tmux theme fragments in Omarchy themes

[crmne]

Summary

Adds optional tmux theme fragments loaded from the active Omarchy theme.

This lets themes ship a tmux.conf fragment alongside existing app-specific
theme files, while keeping the default tmux colors intact for themes that do not
provide one.

Changes

• Sources ~/.config/omarchy/current/theme/tmux.conf from the default tmux config when present.
• Reloads tmux when changing Omarchy themes.
• Uses tmux ls instead of pgrep so tmux is only reloaded when a server is reachable.

Testing

• git diff --check origin/dev..cp/tmux-theme-fragments
• bash -n bin/omarchy-restart-tmux
• bash -n bin/omarchy-theme-set

[Copilot]

Pull request overview

This PR adds support for optional tmux theme fragments that are loaded from the active Omarchy theme, allowing themes to ship a tmux.conf alongside other theme assets while keeping default tmux styling when no fragment is present.

Changes:

• Source ~/.config/omarchy/current/theme/tmux.conf from the main tmux config when it exists.
• Reload tmux configuration when switching Omarchy themes.
• Use tmux ls (instead of process checks) so tmux reload only happens when a tmux server is reachable.

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Reviewed changes

Copilot reviewed 1 out of 3 changed files in this pull request and generated no comments.

File	Description
config/tmux/tmux.conf	Adds an optional theme fragment include for tmux.
bin/omarchy-theme-set	Reloads tmux when applying a new Omarchy theme.
bin/omarchy-restart-tmux	Switches to tmux ls gating and reloads tmux configuration.

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[dhh]

Can you show me some before/after images of how you have put this to good use in a theme?