fix: open OSC 8 file links

[EAnderson-Shopify]

What

• Let explicit OSC 8 file:// metadata reach the existing modified-click opener.
• Preserve the existing http:// / https:// behavior.
• Keep unsafe schemes and plain-text file:// strings inert.

Reproduction

In Herdr 0.7.4 or 0.7.5, emit an OSC 8 file link and Ctrl-click its label:

printf '\033]8;;file:///tmp/example.txt\033\\open file\033]8;;\033\\\n'

Before this change, url_at_pane_cell drops the target through the HTTP-only safe_web_url filter. The added regression covers HTTP metadata precedence, file:// acceptance, and unsafe-scheme rejection.

Verification

• cargo fmt --check passes.
• Repository CI passes on macOS, Ubuntu, and Windows, including the Windows ConPTY package check.
• Local Rust execution was blocked before tests by the vendored libghostty-vt Zig build crashing in the Nix dev shell; repository CI completed the full check matrix successfully.

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