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/ltex.lua

@@ -1,66 +1,9 @@
--- Grammar & spell checking for LaTeX/Markdown via LanguageTool (LTeX-LS)
 return {
-  -- Tell AstroLSP to manage the ltex server and pass our settings
-  {
-    "AstroNvim/astrolsp",
-    ---@param opts AstroLSPOpts
-    opts = function(_, opts)
-      opts.servers = opts.servers or {}
-      if not vim.tbl_contains(opts.servers, "ltex") then table.insert(opts.servers, "ltex") end
-
-      -- Extend the ltex server configuration
-      opts.config = require("astrocore").extend_tbl(opts.config or {}, {
-        ltex = {
-          filetypes = { "tex", "plaintex", "bib", "markdown" },
-          settings = {
-            ltex = {
-              -- Run checks on save for performance; switch to "edit" if you prefer live feedback
-              checkFrequency = "save",
-              -- Pick the language you want LTeX to check as the document language
-              language = "en-GB",
-              -- Mother tongue helps the grammar engine (adjust to your preference)
-              additionalRules = { motherTongue = "de-DE" },
-              -- Let ltex_extra manage dictionaries/rules on disk
-              dictionary = {
-                ["en-GB"] = {},
-                ["de-DE"] = {},
-                ["fr-FR"] = {},
-              },
-              disabledRules = {
-                ["en-GB"] = {},
-                ["de-DE"] = {},
-                ["fr-FR"] = {},
-              },
-              hiddenFalsePositives = {
-                ["en-GB"] = {},
-                ["de-DE"] = {},
-                ["fr-FR"] = {},
-              },
-            },
-          },
-          -- hook up ltex_extra when the server attaches
-          on_attach = function(client, bufnr)
-            local ok, ltex_extra = pcall(require, "ltex_extra")
-            if ok then
-              ltex_extra.setup {
-                -- load both EN+DE dictionaries; change to your set
-                load_langs = { "en-GB", "de-DE", "fr-FR" },
-                init_check = true,
-                -- store per-project files in .ltex (add to .gitignore if you want)
-                path = ".ltex",
-                log_level = "none",
-              }
-            end
-          end,
-        },
-      })
-    end,
-  },
-
-  -- Companion plugin: add-to-dictionary / disable-rule / hide-false-positive
+  -- ltex_extra: persist custom dictionary/rules to disk
   {
     "barreiroleo/ltex_extra.nvim",
-    ft = { "tex", "plaintex", "markdown" },
+    ft = { "tex", "plaintex", "bib", "markdown" },
     lazy = true,
+    -- Actual setup happens in lua/lsp/ltex.lua on_attach
   },
 }