tui: restore visible line numbers for hidden file links

[pash-openai]

we recently changed file linking so the model uses markdown links when it wants something to be clickable.

This works well across the GUI surfaces because they can render markdown cleanly and use the full absolute path in the anchor target.

A previous pass hid the absolute path in the TUI (and only showed the label), but that also meant we could lose useful location info when the model put the line number or range in the anchor target instead of the label.

This follow-up keeps the TUI behavior simple while making local file links feel closer to the old TUI file reference style.

key changes:

• Local markdown file links in the TUI keep the old file-ref feel: code styling, no underline, no visible absolute path.
• If the hidden local anchor target includes a location suffix and the label does not already include one, we append that suffix to the visible label.
• This works for single lines, line/column references, and ranges.
• If the label already includes the location, we leave it alone.
• normal web links keep the old TUI markdown-link behavior

some examples:

• [foo.rs](/abs/path/foo.rs) renders as foo.rs
• [foo.rs](/abs/path/foo.rs:45) renders as foo.rs:45
• [foo.rs](/abs/path/foo.rs:45:3-48:9) renders as foo.rs:45:3-48:9
• [foo.rs:45](/abs/path/foo.rs:45) stays foo.rs:45
• [docs](https://example.com/docs) still renders like a normal web link

how it looks:

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

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