fix: add rss mime type to text types

[dword-design]

resolves #597

Alternative would be to turn the set into a set of regexes and have application\/([a-z]+\+)?xml in it, which would be rss-agnostic. I'm not sure which mime types exist that are formed like this, maybe someone can help ☺️.

Summary by CodeRabbit

• Bug Fixes
  • RSS feed responses are now correctly recognized as text, improving how they’re handled and displayed instead of being treated as binary data.

[coderabbitai]

📝 Walkthrough

Walkthrough

application/rss+xml is now recognized as a text response type, so RSS feeds are classified as "text" instead of falling through to "blob".

Changes

RSS response detection

Layer / File(s)	Summary
Text MIME types src/utils.ts	textTypes now includes application/rss+xml, and response-type detection classifies RSS responses as text.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 I nibbled a MIME leaf neat and bright,
RSS now reads as text just right.
No blob-hop detour, no fuzzy disguise,
Just tidy feeds for my twitchy eyes.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the RSS MIME type fix.
Linked Issues check	✅ Passed	The change matches issue #597 by treating application/rss+xml as text instead of Blob.
Out of Scope Changes check	✅ Passed	The PR contains only the targeted MIME type update and no unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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