nvim,tmux,kitty: full config overhaul (AstroNvim → native 0.12)

Replaces AstroNvim v5 with from-scratch Neovim 0.12 config using
vim.lsp.config()/vim.lsp.enable() natively, lazy.nvim, blink.cmp,
and smart-splits tmux integration.

tmux: new C-Space prefix, hjkl pane nav, resize key table, tpm plugins.
kitty: add allow_remote_control for smart-splits.

dot_config/nvim/lua/plugins/pandoc.lua

@@ -1,25 +1,2 @@
--- A vimtex-like workflow for compiling Markdown to PDF using pandoc
-return {
-  "arminveres/md-pdf.nvim",
-  lazy = true,
-  -- Set up a keymap for compiling
-  keys = {
-    {
-      "<Leader>mc",
-      function()
-        -- The plugin's main function to convert markdown to pdf
-        require("md-pdf").convert_md_to_pdf()
-      end,
-      desc = "Markdown Compile",
-    },
-  },
-  -- Configure the plugin
-  opts = {
-    -- Set zathura as the PDF viewer to match the vimtex setup
-    preview_cmd = function()
-      return "zathura"
-    end,
-    -- other options...
-    ignore_viewer_state = true, -- Auto-recompile PDF on each write
-  },
-}
+-- Removed: not part of the from-scratch config
+return {}