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/configs/cmp.lua

@@ -3,11 +3,11 @@ local lspkind = require "lspkind"
 local nvchad_options = require "nvchad.configs.cmp"
 
 local options = {
+  -- Supermaven handles AI completion inline (ghost text, accept with <C-Enter>);
+  -- it is not a cmp source, so it is intentionally absent here.
   sources = {
-    -- { name = "supermaven" },
     { name = "nvim_lsp" },
     { name = "luasnip" },
-    { name = "copilot" },
     { name = "buffer" },
     { name = "nvim_lua" },
     { name = "path" },
@@ -17,7 +17,6 @@ local options = {
     format = lspkind.cmp_format {
       mode = "symbol",
       max_width = 50,
-      symbol_map = { Supermaven = "" },
     },
   },
 }