fix(elfeed): bound and clean up the synchronous YouTube fetch

cj/youtube-to-elfeed-feed-format called url-retrieve-synchronously with no timeout, so a hung YouTube request would block Emacs indefinitely, and it only killed the temporary URL buffer when an ID was successfully extracted — a page without the expected markers leaked the buffer.

Passed cj/elfeed-url-fetch-timeout (10s) to the synchronous fetch, and moved the fetch+parse into an unwind-protect that always kills the temp buffer (live-p guarded), including the parse-failure path. Tests mock the network boundary and cover a normal channel parse, that a timeout is passed, and that the buffer is not leaked when parsing fails.

Also added tests for the EWW user-agent advice (no code change): it already injects the desktop UA only from eww-mode buffers, so package.el and other non-EWW url callers pass through untouched — the tests pin that scoping and the replace-not-duplicate header behavior.

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