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/blink-latex.lua

@@ -1,39 +1,2 @@
-return {
-  -- Let blink.cmp consume nvim-cmp sources
-  { "saghen/blink.compat", version = "2.*", lazy = true, opts = {} },
-
-  -- Add vimtex + latex symbol sources to blink.cmp
-  {
-    "Saghen/blink.cmp",
-    optional = true,
-    dependencies = {
-      "micangl/cmp-vimtex", -- environments, \cite, \ref, etc. via vimtex
-      "kdheepak/cmp-latex-symbols", -- math symbols via LaTeX macros
-    },
-    opts = function(_, opts)
-      opts.sources = opts.sources or {}
-      opts.sources.providers = opts.sources.providers or {}
-      opts.sources.default = opts.sources.default or { "lsp", "path", "snippets", "buffer" }
-
-      -- Only turn on the LaTeX sources for TeX filetypes
-      opts.sources.per_filetype = vim.tbl_deep_extend("force", opts.sources.per_filetype or {}, {
-        tex = { inherit_defaults = true, "vimtex", "latex_symbols" },
-        plaintex = { inherit_defaults = true, "vimtex", "latex_symbols" },
-      })
-
-      -- Expose nvim-cmp sources to blink via blink.compat
-      opts.sources.providers.vimtex = {
-        name = "vimtex",
-        module = "blink.compat.source",
-      }
-      opts.sources.providers.latex_symbols = {
-        name = "latex_symbols",
-        module = "blink.compat.source",
-        -- Insert LaTeX commands (e.g. \alpha) instead of Unicode characters:
-        opts = { strategy = 2 }, -- documented in cmp-latex-symbols README
-        score_offset = -2, -- keep it below LSP/snippets in relevance
-      }
-      return opts
-    end,
-  },
-}
+-- blink.cmp LaTeX sources are configured in completion.lua
+return {}