fix: encode non-ASCII directory paths in HTTP headers

[jwaterwater]

Fixes error when directory paths contain non-ASCII characters (e.g., Chinese) by using percent-encoding for the x-opencode-directory header, as HTTP headers must be ISO-8859-1 compatible.

[github-actions[bot]]

The following comment was made by an LLM, it may be inaccurate:

I found a related PR:

Potential Related PR:

• PR #7031: "fix(app) TypeError: Failed to execute 'set' on 'Headers': String contains non IS0-8859-1 code point."
  • URL: https://github.com/anomalyco/opencode/pull/7031
  • This appears to be addressing the same underlying issue - HTTP headers with non-ISO-8859-1 characters causing failures. It may be a related or previous attempt to fix the same problem.

You should check if PR #7031 is already closed/merged and whether it addresses the same root cause, as this could indicate a duplicate effort.