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/vimtex.lua

@@ -1,22 +1,28 @@
 return {
-  "lervag/vimtex",
-  ft = { "tex", "latex" }, -- lazy-load on filetype
-  init = function()
-    -- Viewer
-    vim.g.vimtex_view_method = "zathura"
-
-    -- Compiler: latexmk + LuaLaTeX
-    vim.g.vimtex_compiler_method = "latexmk"
-    -- Option A: pass -lualatex explicitly to latexmk
-    vim.g.vimtex_compiler_latexmk = {
-      options = {
-        "-lualatex",
-        "-synctex=1",
-        "-interaction=nonstopmode",
-        "-file-line-error",
-      },
-    }
-    -- Option B (also helpful): make LuaLaTeX the default engine for latexmk
-    vim.g.vimtex_compiler_latexmk_engines = { _ = "-lualatex" }
-  end,
+  -- VimTeX: LaTeX compilation, navigation, text objects
+  {
+    "lervag/vimtex",
+    ft = { "tex", "plaintex", "bib" },
+    init = function()
+      -- Must be set before vimtex loads
+      vim.g.vimtex_view_method = "zathura"
+      vim.g.vimtex_compiler_method = "latexmk"
+      vim.g.vimtex_compiler_latexmk = {
+        options = {
+          "-pdf",
+          "-shell-escape",
+          "-verbose",
+          "-file-line-error",
+          "-synctex=1",
+          "-interaction=nonstopmode",
+          "-lualatex",
+        },
+      }
+      -- Disable vimtex completion (blink.cmp handles it via cmp-vimtex)
+      vim.g.vimtex_complete_enabled = 0
+      -- Disable vimtex's own syntax (use treesitter instead, with vim regex fallback)
+      vim.g.vimtex_syntax_enabled = 1
+      vim.g.vimtex_syntax_conceal_disable = 0
+    end,
+  },
 }