Summary

Add fzf-lua as an input method for displaying fixture usages.

Changes

• New module lua/pytrize/fzf.lua — displays fixture usages in an fzf-lua picker with built-in previewer and standard file actions (edit, split, vsplit, tab)
• usages.lua — dispatches to fzf-lua when preferred_input = 'fzf-lua', with graceful fallback to quickfix if fzf-lua is not installed
• settings.lua — uses a valid_keys lookup table so nil-defaulted settings like preferred_input are not rejected as unknown keys
• README — updated configuration and input sections to document fzf-lua support; removed references to telescope, nui, and inputlist which are no longer supported
• Tests — added test for fzf-lua fallback behavior

Usage

require('pytrize').setup({
  preferred_input = 'fzf-lua',
})

Then call PytrizeFixtureUsages with cursor on a fixture name.