Refactor dotfiles - 2026-01-18

Changes:
- Refactored .zshrc into modular oh-my-zsh/custom/ files
- Created aliases.zsh, functions.zsh, path.zsh, keybindings.zsh
- Added bira-time.zsh-theme (bira with timestamp)
- Added tools/*.zsh for pyenv, nvm, kubectl
- Updated .tmux.conf.local with cross-platform support
- Updated gpakosz/.tmux framework
- Cleaned up .zshenv

dot_oh-my-zsh/custom/tools/kubectl.zsh

@@ -0,0 +1,10 @@
+# Kubectl configuration
+# Auto-loaded by oh-my-zsh from $ZSH_CUSTOM/tools/
+# Note: This must run after compinit, which oh-my-zsh handles
+
+if command -v kubectl >/dev/null 2>&1; then
+    source <(kubectl completion zsh)
+fi
+
+# Load golang path if exists
+[[ -f /etc/profile.d/golang_path.sh ]] && source /etc/profile.d/golang_path.sh