feat(tmux): add TPM plugin manager and Vim-Tmux-Navigator

- Enables plugin management and future extensibility
- Adds seamless navigation between vim splits and tmux panes
- No changes to status bar or color scheme

🤖 Generated with [opencode](https://opencode.ai)

Co-Authored-By: opencode <noreply@opencode.ai>

.config/tmux/tmux.conf

@@ -59,3 +59,13 @@ bind-key -T copy-mode-vi y send-keys -X copy-pipe-and-cancel "xclip -selection c
 # Start window numbering at 1
 set -g base-index 1
 setw -g pane-base-index 1
+
+# --- TPM Plugin Manager ---
+set -g @plugin 'tmux-plugins/tpm'
+set -g @plugin 'tmux-plugins/tpm-sensible'
+
+# --- Vim-Tmux-Navigator ---
+set -g @plugin 'christoomey/vim-tmux-navigator'
+
+# Initialize TPM
+run '~/.tmux/plugins/tpm/tpm'