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/treesitter.lua

@@ -1,15 +1,70 @@
-if true then return {} end -- WARN: REMOVE THIS LINE TO ACTIVATE THIS FILE
-
--- Customize Treesitter
-
----@type LazySpec
 return {
-  "nvim-treesitter/nvim-treesitter",
-  opts = {
-    ensure_installed = {
-      "lua",
-      "vim",
-      -- add more arguments for adding more treesitter parsers
+  {
+    "nvim-treesitter/nvim-treesitter",
+    build = ":TSUpdate",
+    event = { "BufReadPost", "BufNewFile" },
+    dependencies = {
+      "nvim-treesitter/nvim-treesitter-textobjects",
     },
+    opts = {
+      ensure_installed = {
+        "lua", "rust", "typescript", "javascript", "svelte",
+        "java", "latex", "markdown", "markdown_inline",
+        "yaml", "toml", "bash", "html", "css", "jinja",
+        "json", "vim", "vimdoc", "regex",
+      },
+      auto_install = true,
+      highlight = {
+        enable = true,
+        additional_vim_regex_highlighting = { "latex" }, -- needed for vimtex
+      },
+      indent = { enable = true },
+      incremental_selection = {
+        enable = true,
+        keymaps = {
+          init_selection = "<C-space>",
+          node_incremental = "<C-space>",
+          scope_incremental = false,
+          node_decremental = "<bs>",
+        },
+      },
+      textobjects = {
+        select = {
+          enable = true,
+          lookahead = true,
+          keymaps = {
+            ["am"] = "@function.outer",
+            ["im"] = "@function.inner",
+            ["ac"] = "@class.outer",
+            ["ic"] = "@class.inner",
+            ["a,"] = "@parameter.outer",
+            ["i,"] = "@parameter.inner",
+          },
+        },
+        move = {
+          enable = true,
+          set_jumps = true,
+          goto_next_start = {
+            ["]m"] = "@function.outer",
+            ["]c"] = "@class.outer",
+          },
+          goto_next_end = {
+            ["]M"] = "@function.outer",
+            ["]C"] = "@class.outer",
+          },
+          goto_previous_start = {
+            ["[m"] = "@function.outer",
+            ["[c"] = "@class.outer",
+          },
+          goto_previous_end = {
+            ["[M"] = "@function.outer",
+            ["[C"] = "@class.outer",
+          },
+        },
+      },
+    },
+    config = function(_, opts)
+      require("nvim-treesitter.configs").setup(opts)
+    end,
   },
 }