chore(main): release 3.18.0

[github-actions]

🤖 I have created a release beep boop

3.18.0 (2026-05-17)

Features

• lsp: add flux language server configuration (b138200)
• plugins: replace markdown-preview.nvim with peek.nvim (5e807e8)
• ui: review fixes + multi_select test - Fix backspace detection in listbox/textbox search (code==128 -> ch==\127/\x80kb) - Fix UTF-8 safe backspace in search pattern (sub -> strcharpart) - Wrap event loops in pcall for context_menu/listbox/multi_select/textbox - Fix confirm VenuxConfirmHotkeyOn highlight (link ignores underline attr) - Add test_multi_select.lua with 6 test scenarios (e538121)

Bug Fixes

• address config review findings (e0253ca)
• clean generated files and harden plugin config (44fdc8c)
• remove deprecated nil arg in vim.diagnostic.open_float and apply stylua formatting (ac44818)
• treesitter: use win= for window-local fold options in set_fold (b4f60b0)

Performance Improvements

• fix performance and stability issues from code review (8a1159d)
• modernize terminal workflow and lazy-load more plugins (839a5e0)
• optimize c++ workflows for large codebases (3d5fb13)
• treesitter: improve large file protection and fold fallback (de06ba7)

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