Oxide: warn if file takes >3s to process

[mustafa0x]

tailwindcss started taking 20s to process my repo. I had no idea why, and spent over an hour investigating. It turned out the cause was a temp 3mb html file (generated by rollup-plugin-visualizer).

I think tw should warn if a file takes >3s to be processed. Especially if DEBUG=* is set.

The debug log had no indication as to what file was the reason. All I could learn from it was that tailwindcss_oxide::scanner took 20s from enter to exit.

2025-09-04T12:53:27.647374Z  INFO extract_candidates:parse_all_blobs:extract: tailwindcss_oxide::scanner: enter
2025-09-04T12:53:48.172613Z  INFO extract_candidates:parse_all_blobs:extract: tailwindcss_oxide::scanner: exit