fix(nvim): align Tree-sitter with Neovim 0.12

[bupd]

Summary

• migrate nvim-treesitter from the obsolete master API to the supported main API for Neovim 0.12
• install and update the configured parser set through the rewritten API, including markdown_inline
• start highlighting and indentation through Neovim's native Tree-sitter APIs while retaining the 100 KB guard
• remove the local query-directive compatibility shim that is no longer needed on main
• update the Lazy lockfile to the current main commit

Root cause

The configuration was running Neovim 0.12 with the old nvim-treesitter implementation. Markdown fenced-code injections then passed multi-node captures through compatibility directives written for the earlier query API, causing repeated attempt to call method 'range' (a nil value) errors from both the Tree-sitter decoration provider and render-markdown.nvim.

Impact

Markdown files with fenced code blocks render normally again without repeated redraw errors. Parser versions will remain aligned with plugin query versions through Lazy's :TSUpdate build hook.

The rewritten plugin requires Tree-sitter CLI 0.26.1 or newer; validation used 0.26.9.

Validation

• luac -p .config/nvim/lua/plugins/treesitter.lua
• nvim --headless README.md '+sleep 2' '+messages' '+qa!'
• git diff --check
• verified Markdown, Lua, and empty headless startup with no Tree-sitter or render-markdown errors