feat(cli): frecency file autocomplete

[galkatz373]

Added support for frecency (frequency + recency) to the file autocomplete in the cli.

For example after I selected the new file

packages/opencode/src/cli/cmd/tui/component/prompt/frecency.tsx

and opened the file autocomplete again.

Before:

Screen.Recording.2026-01-01.at.23.57.58.mov

After

Screen.Recording.2026-01-01.at.23.55.51.mov

[rekram1-node]

/review

[galkatz373]

@rekram1-node I replaced fs.writeFile with Bun.write, and kept fs.appendFile since bun doesn't have an equivalent. Also, changed the saved path to absolute, so it won't conflict between projects. I also limited the amount of entries in the new jsonl file to 1000 entries