fix(config): cleanup bugs, redundancy, and add agent-friendly auto-reload

- remove broken mini.files mappings (plugin disabled; yazi is used now)
- dedupe tint.nvim spec (drop plugins/theme.lua, keep ui.lua)
- drop dead copilot cmp source + moot Supermaven symbol (Supermaven stays inline)
- remove yaml from biome formatters (biome has no yaml support)
- collapse 3x biome chain to a single biome-check pass
- remove duplicate insert-mode jk mapping
- lazy-load tailwind-tools by filetype
- diagnostics: update_in_insert = false
- untrack .nvimlog, add .gitignore
- auto-reload files changed on disk (autoread + checktime autocmds)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lua/mappings.lua

@@ -2,29 +2,13 @@ require "nvchad.mappings"
 
 local map = vim.keymap.set
 
--- remove nvim-tree mappings (using mini.files instead)
+-- remove nvim-tree mappings (nvim-tree disabled; using yazi instead, see plugins/yazi.lua)
 vim.keymap.del("n", "<leader>e")
 vim.keymap.del("n", "<C-n>")
 vim.keymap.del("n", "<leader>rn")
 map("n", "<leader>rn", vim.lsp.buf.rename, { desc = "LSP Rename" })
 
--- mini.files
-map("n", "<leader>e", function()
-  local MiniFiles = require "mini.files"
-  if not MiniFiles.close() then
-    MiniFiles.open(vim.api.nvim_buf_get_name(0))
-  end
-end, { desc = "File explorer (current file)" })
-
-map("n", "<leader>E", function()
-  local MiniFiles = require "mini.files"
-  if not MiniFiles.close() then
-    MiniFiles.open(vim.uv.cwd())
-  end
-end, { desc = "File explorer (cwd)" })
-
 map("n", ";", ":", { desc = "CMD enter command mode" })
-map("i", "jk", "<ESC>")
 
 -- close current buffer
 map("n", "<leader>q", ":q<cr>")