chore(config): update terminal, tmux, and starship configurations

dot_config/omarchy/themed/tmux.conf.tpl

@@ -0,0 +1,7 @@
+# tmux window-tab colors, rendered per theme into
+# ~/.local/state/omarchy/current/theme/tmux.conf and sourced by tmux.conf.
+# Same derivation as the kitty tab bar in kitty.conf.tpl.
+set -g @tab-bg "{{ background }}"
+set -g @tab-fg "{{ muted }}"
+set -g @tab-active-bg "{{ mix accent background 80% }}"
+set -g @tab-active-fg "{{ accent }}"