refactor: switch to catppuccin mocha across tmux and neovim

- tmux: hand-rolled catppuccin theme, three-way status bar toggle, plugin cleanup
- nvim: switch colorscheme to catppuccin-mocha, update lualine colors
- nvim: add tmuxline.vim for tmux statusline generation
- kitty: fix MesloLGS NF font typo, remove deprecated config keys

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

kitty/kitty.conf

@@ -1,13 +1,13 @@
 # Font Configuration
-font_family        MesloGS NF
+font_family        MesloLGS NF
 bold_font          auto
-italic_font        auto 
+italic_font        auto
 bold_italic_font   auto
 font_size          15
 
 # Font rendering improvements
 disable_ligatures  never
-font_features      MesloGSNF +calt +liga
+font_features      MesloLGSNF +calt +liga
 text_composition_strategy platform
 undercurl_style    thin-sparse
 
@@ -41,7 +41,7 @@ background_blur 3
 
 # macOS Specific
 hide_window_decorations yes
-macos_titlebar_color background
+# macos_titlebar_color background
 macos_option_as_alt yes
 macos_window_resizable yes
 
@@ -58,7 +58,7 @@ include ./keymap.conf
 macos_show_window_title_in none
 
 # BEGIN_KITTY_THEME
-# Monokai Classic
+# Catppuccin-Macchiato
 include current-theme.conf
 # END_KITTY_THEME
 
@@ -76,21 +76,19 @@ touch_scroll_multiplier 1.0
 
 # URL Handling
 detect_urls yes
-url_color #0087bd
+# url_color #0087bd
 url_style curly
 open_url_with default
 copy_on_select no
 strip_trailing_spaces never
 
 # Selection
-rectangle_select_modifiers ctrl+alt
-terminal_select_modifiers shift
 select_by_word_characters @-./_~?&=%+#
 
 # Advanced Features
 allow_hyperlinks yes
 shell_integration enabled
-term xterm-256color
+# term xterm-256color
 # Fixed backspace mapping
 map backspace send_text all \x7f
 
@@ -110,7 +108,6 @@ clipboard_control write-clipboard write-primary read-clipboard-ask read-primary-
 clipboard_max_size 64
 
 # Notifications
-enable_notifications yes
 notify_on_cmd_finish invisible 30.0
 
 # Ask for confirmation on program close (Cmd+Q) but not on tab close