`[multi\nline](http://x)` produced `Inline::Link.text = "multiline"`
because the SoftBreak/HardBreak handler called `push_text(" ")` —
which updates `paragraph.text` and the inline buffer, but NOT the
open link frame's flattened text accumulator. Text events flowed
through `push_link_text`; line breaks didn't.
Add `push_link_text(" ")` alongside the existing `push_text(" ")` in
the break handler so a line break inside `[ ... ](href)` collapses
to a visible space rather than disappearing.
New tests:
- link_with_soft_break_preserves_space_in_text
- link_with_hard_break_preserves_space_in_text
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
altair823
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