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

dot_config/omarchy/hooks/theme-set.d/executable_tmux-tabs

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+#!/bin/bash
+
+# Recolor tmux's window tabs on theme change, as kitty's tab bar does: re-read
+# the @tab-* colors rendered from ~/.config/omarchy/themed/tmux.conf.tpl.
+# tmux.conf's status formats read those options live; the bar picks them up
+# on its next redraw (status-interval 5).
+tmux source-file -q ~/.local/state/omarchy/current/theme/tmux.conf 2>/dev/null || true

dot_config/omarchy/themed/tmux.conf.tpl

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+# 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 }}"