fix(url): extend URL detection across hard-wrap row boundaries

[rndjams]

Fixes #11609

Summary

AI TUI tools (Kiro CLI, Claude Code, GSD) write output with explicit \r\n, producing hard-wrapped rows where WRAPLINE is absent. When a URL overflows the terminal width, url_at_point returns only the first-row fragment — CMD+click opens a truncated, invalid URL.

Changes

1. url_at_point continuation probe (grid_handler.rs)

After the forward scan loop completes, probes across the hard-wrap boundary when:

• URL ends within 4 cols of the right edge (near_right_edge)
• Row is hard-wrapped (!self.row_wraps() — WRAPLINE absent)
• Next row exists (checked_add overflow-safe)

Guards are all O(1). Common case (short URL, soft-wrap, or URL not near edge) exits immediately at near_right_edge with zero additional allocations.

Continuation is rejected if the first char is uppercase (new-sentence guard) or whitespace (indented-block guard).

2. link_at_range newline stripping (terminal_model.rs)

Strips embedded \n/\r from the concatenated URL text. RFC 3986 URLs cannot contain raw newlines. All existing callers are URL-specific (guarded by GridHighlightedLink::Url). No-op for single-row URLs.

Behavior invariants

1. URL ending near right edge of hard-wrapped row + valid continuation → full URL returned
2. Existing soft-wrap detection unaffected (row_wraps() == true → probe does not fire)
3. Uppercase-start continuation rejected (prevents false join with sentence starts)
4. Whitespace-start continuation rejected
5. Hovering on continuation row returns None (backward scan limitation — V1 scope)

Known limitation

URLs whose continuation begins with uppercase (e.g., /OAuth2/callback) are not extended. Deliberate tradeoff to avoid false joins with prose. V2 can relax this when continuation immediately follows /.

V1 scope boundary

• ✅ Single-row continuation (wraps once)
• ✅ Hard-wrapped rows only
• ✅ Forward extension only
• ❌ Multi-row wraps (V2)
• ❌ Backward extension from continuation row (V2)
• ❌ OSC 8 (Add support for OSC 8: Hyperlinks in the terminal #4194 supersedes when it ships)

Testing

cargo test -p warp --lib grid_handler_tests::test_url_extends_across_hard_wrap
cargo test -p warp --lib grid_handler_tests::test_url_hard_wrap_no_extend

4 new tests covering: extension across boundary, uppercase rejection, whitespace rejection, backward-scan limitation.

Existing test_find_url_line_wrapping (soft-wrap) passes unchanged.

Manual testing

1. Run printf "See: https://auth.example.com/oauth/v2/authorize?client_id=app&state=abc123\r\n&redirect_uri=https%%3A%%2F%%2Fapp.example.com\r\n" in Warp
2. Hover first row → full URL highlighted across both rows
3. CMD+click → opens complete URL
4. Hover second row → no highlight (V1 limitation, documented)

[oz-for-oss]

@rndjams

This PR is not linked to an issue that is marked with ready-to-implement.

Issue-state enforcement details:

• Associated same-repo issues checked: URL soft-wrap: AI TUI output splits URLs across rows — CMD+click opens truncated fragment #11609

• Required readiness label: ready-to-implement

Readiness check:

• URL soft-wrap: AI TUI output splits URLs across rows — CMD+click opens truncated fragment #11609: missing ready-to-implement; readiness labels present: none

To continue, link this PR to a same-repo issue such as Closes #123 in the PR description, and make sure that issue has ready-to-implement.

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[oz-for-oss]

@rndjams

This PR is not linked to an issue that is marked with ready-to-implement.

Issue-state enforcement details:

• Associated same-repo issues checked: #11609

• Required readiness label: ready-to-implement

Readiness check:

• #11609: missing ready-to-implement; readiness labels present: none

To continue, link this PR to a same-repo issue such as Closes #123 in the PR description, and make sure that issue has ready-to-implement.

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