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/autopairs.lua

@@ -1,29 +1,2 @@
-return {
-  "windwp/nvim-autopairs",
-  config = function(plugin, opts)
-    require "astronvim.plugins.configs.nvim-autopairs"(plugin, opts) -- include the default astronvim config that calls the setup call
-    -- add more custom autopairs configuration such as custom rules
-    local npairs = require "nvim-autopairs"
-    local Rule = require "nvim-autopairs.rule"
-    local cond = require "nvim-autopairs.conds"
-    npairs.add_rules(
-      {
-        Rule("$", "$", { "tex", "latex" })
-          -- don't add a pair if the next character is %
-          :with_pair(cond.not_after_regex "%%")
-          -- don't add a pair if  the previous character is xxx
-          :with_pair(
-            cond.not_before_regex("xxx", 3)
-          )
-          -- don't move right when repeat character
-          :with_move(cond.none())
-          -- don't delete if the next character is xx
-          :with_del(cond.not_after_regex "xx")
-          -- disable adding a newline when you press <cr>
-          :with_cr(cond.none()),
-      },
-      -- disable for .vim files, but it work for another filetypes
-      Rule("a", "a", "-vim")
-    )
-  end,
-}
+-- nvim-autopairs is configured in editing.lua
+return {}