feat(nvim): add LaTeX workflow; tweak Hyprland master; refresh CS autoexec; add GTK bookmark

Neovim (LaTeX):
- Add TeX ftplugin: spell (en_US,de_DE), soft-wrap + linebreak, conceal=2, no hard wrap
- Add plugins: vimtex (zathura; latexmk with LuaLaTeX + shell-escape),
  LTeX language server via astrolsp + ltex_extra (check on save; motherTongue=de-DE),
  blink.cmp integration (cmp-vimtex, cmp-latex-symbols → insert macros),
  LuaSnip LaTeX snippets, Treesitter “latex”, nabla.nvim (inline/popup math; <leader>mp/<leader>mv)

Hyprland:
- Set master.orientation=left; comment out center_master_* options

Counter-Strike autoexec:
- Rebind +lookatweapon → MOUSE5; map R → lastinv; radio on Y/U/I/H; J → +radialradio
- Crosshair tweaks: size 2.5, gap -3, no outline, alpha off
- Mouse: sensitivity 0.619; zoom_sensitivity_ratio 1.0
- Viewmodel: offset_x -2; cl_prefer_lefthanded 0
- Video/perf: gamma 1.6; set fps_max/fps_max_ui 0; drop legacy perf/network cvars (mat_queue_mode, cl_forcepreload, rate/interp*)
- HUD cleanup: disable target ID; remove +cl_show_team_equipment

GTK:
- Add bookmark: Documents/ttrpg/dsa5

.config/nvim/lua/plugins/latex-snippets.lua

@@ -0,0 +1,17 @@
+-- Gilles Castel-style LaTeX snippets for LuaSnip
+return {
+  -- Make sure autosnippets are enabled globally
+  {
+    "L3MON4D3/LuaSnip",
+    opts = function(_, _) require("luasnip").config.setup { enable_autosnippets = true } end,
+  },
+
+  -- The LaTeX snippets themselves
+  {
+    "iurimateus/luasnip-latex-snippets.nvim",
+    ft = { "tex", "plaintex", "markdown" },
+    dependencies = { "L3MON4D3/LuaSnip", "lervag/vimtex" },
+    opts = { use_treesitter = false, allow_on_markdown = true }, -- use vimtex to detect math mode
+    config = function(_, opts) require("luasnip-latex-snippets").setup(opts) end,
+  },
+}