feat(dotfiles): Add fish-shell & tmux configuration

dotfiles/config.fish

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+# Configure classic prompt
+set fish_color_user --bold blue
+set fish_color_cwd --bold white
+#set __fish_git_prompt_color green
+set __fish_git_prompt_showcolorhints yes
+set __fish_git_prompt_color_prefix purple
+set __fish_git_prompt_color_suffix purple
+
+# Fish configuration
+set fish_greeting ""
+set PATH $HOME/.local/bin $GOPATH/bin $PATH
+
+# Editor configuration
+set -gx EDITOR "emacsclient"
+set -gx ALTERNATE_EDITOR "emacs -q -nw"
+set -gx VISUAL "emacsclient"
+
+# Miscellaneous
+eval (direnv hook fish)
+
+# Useful command aliases
+alias gpr 'git pull --rebase'
+alias gco 'git checkout'
+alias gf 'git fetch'
+alias gap 'git add -p'
+alias pbcopy 'xclip -selection clipboard'
+alias edit 'emacsclient -n'

dotfiles/tmux.conf

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+set -g status off
+set -gw mode-keys emacs
+setw -g mouse on
+
+# Correctly set window titles
+set -g set-titles on
+set -g set-titles-string "#W (#T)"
+
+# List of plugins
+set -g @plugin 'tmux-plugins/tpm'
+set -g @plugin 'tmux-plugins/tmux-yank'
+
+# Initialize TMUX plugin manager (keep this line at the very bottom of tmux.conf)
+run '~/.tmux/plugins/tpm/tpm'