[diffs/edit] Fix search-replace capture expansion with lookaround

[ije]

Search-replace capture expansion with lookaround (3) — replacement-text
expansion re-executes the pattern against only the matched slice, so
lookaround context outside the slice is lost: a lookbehind whose context sits
before the slice, a lookahead whose context sits after the slice, and a
lookahead that re-matches shorter on the slice all fall back to inserting the
literal (unexpanded) replacement text.

Fixed search-replace capture expansion with lookaround.

• Re-executes regex against the full line at the original match offset.
• Validates the exact match range before expanding captures.

[vercel]

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[ije]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: 7865bbb5b7

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