fix(tui): keep wrapped URLs clickable

[Sayt-0]

Summary

• detect complete URLs before tool argument wrapping
• emit each visible wrapped fragment as an OSC 8 hyperlink to the complete destination
• preserve existing visible text, wrapping, indentation, and non-link suffixes
• add an end-to-end regression test for the fetch tool renderer

Issue expectations

Expectation	Implementation
Detect URLs split across terminal lines	URL boundaries are captured before wrapTextWithIndent splits the text
Treat wrapped fragments as one link	Every fragment carries the same complete OSC 8 destination
Keep the entire URL clickable	Click detection is verified on every rendered URL cell
Exclude surrounding text	Parentheses, result summaries, and (+1 more) remain outside the link

Validation

• task build
• task lint
• task test
• go test -race ./pkg/tui/components/toolcommon ./pkg/tui/components/messages

Closes #3821