fix(compiler): reformat one-shot open condition for line length

Problem: the added fs_stat condition exceeded stylua's line length
limit on the one-shot open guard.

Solution: split the boolean condition across multiple lines to match
the project's stylua formatting rules.

lua/preview/compiler.lua

@@ -238,7 +238,12 @@ function M.compile(bufnr, name, provider, ctx, opts)
           r.inject(output_file)
           r.broadcast()
         end
-        if provider.open and not opened[bufnr] and output_file ~= '' and vim.uv.fs_stat(output_file) then
+        if
+          provider.open
+          and not opened[bufnr]
+          and output_file ~= ''
+          and vim.uv.fs_stat(output_file)
+        then
           if provider.open == true then
             vim.ui.open(output_file)
           elseif type(provider.open) == 'table' then