feat(tui): make markdown links and URLs clickable in the terminal

[silvin-lubecki]

Problem:
Long URLs (e.g., Grafana dashboard links with encoded query parameters) were rendered as plain text in the TUI and were not clickable. Markdown links like text displayed both the link text AND the full URL, which cluttered the output. URLs inside code blocks that wrapped across multiple lines were impossible to click in any terminal.

Solution:
Emit OSC 8 hyperlink escape sequences around URLs so that terminals with native support (iTerm2, Kitty, WezTerm) render them as clickable links. For terminals without OSC 8 support (like Warp), extend the TUI's existing hover/click URL detection system to read OSC 8 sequences and resolve clicks on the visible link text to the hidden URL.

Changes:

Markdown renderer (fast_renderer.go):

• text now emits OSC 8 sequences around the visible text instead of displaying the raw URL in parentheses
• Bare URLs (https://...) in inline text are auto-detected and wrapped in OSC 8 sequences
• URLs in fenced code blocks are detected and wrapped in OSC 8
• ansiStringWidth(), splitWordsWithStyles(), breakWord() updated to skip OSC sequences in width calculations and word splitting
• updateActiveStyles() filters out OSC 8 sequences so hyperlinks are not incorrectly propagated across line wraps
• fixHyperlinkWrapping() uses lipgloss.WrapWriter to ensure each wrapped line gets its own OSC 8 open/close pair

URL detection (urldetect.go):

• New extractOSC8Links() parses OSC 8 sequences from rendered lines and maps them to display column positions
• New findAllURLSpans() merges OSC 8 links with visible URL detection, giving priority to OSC 8 spans on overlap
• urlAtPosition() and updateHoveredURL() updated to use the combined detection, enabling hover underline and click-to-open for OSC 8 links

Assisted-By: docker-agent

[rumpl]

/review

[docker-agent]

Assessment: 🟡 NEEDS ATTENTION

[dgageot]

@silvin-lubecki did you address the feedback of the agent?

[silvin-lubecki]

@dgageot PTAL