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fix(md): Prevent inline spans from bleeding across wrap breaks (#591)

When a wrap-break landed between the last breakable space and the
opening of an inline span (e.g. `**bold**`), the ANSI escapes recorded
past the break point were dropped via `self.escapes.clear()`. The
continuation line was then re-stylized using `attrs.restore_sequence()`,
which applied the full current attribute state — including attributes
that had not yet been opened in the visible text — to content that
should have remained unstyled.

The fix introduces `batch_initial_attrs`, which tracks the `AnsiState`
at the start of each wrap-buffer batch. During a wrap-break, escapes are
now partitioned by their offset: those at or before the break point are
replayed onto `batch_initial_attrs` to derive the true state at the
break, while escapes past the break point are carried forward onto the
new buffer with re-anchored offsets. The continuation line is then
restored to only the attributes that were actually active at the break.

The wrap-break logic has also been extracted into a dedicated
`wrap_break()` method, replacing the inline block that previously lived
inside `output()`.

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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