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/pyenv.zsh

@@ -0,0 +1,23 @@
+# Pyenv configuration
+# Auto-loaded by oh-my-zsh from $ZSH_CUSTOM/tools/
+
+export PYENV_ROOT="$HOME/.pyenv"
+[[ -d $PYENV_ROOT/bin ]] && export PATH="$PYENV_ROOT/bin:$PATH"
+
+if command -v pyenv >/dev/null 2>&1; then
+    eval "$(pyenv init - zsh)"
+fi
+
+# Virtualenvwrapper
+export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3
+export VIRTUALENV_PYTHON=python3
+export WORKON_HOME=$HOME/.virtualenvs
+
+if [[ -f /usr/local/bin/virtualenvwrapper.sh ]]; then
+    source /usr/local/bin/virtualenvwrapper.sh
+elif [[ -f $HOME/.virtualenvwrapper.sh ]]; then
+    source $HOME/.virtualenvwrapper.sh
+fi
+
+# Python debugging
+export PYTHONBREAKPOINT=ipdb.set_trace