[Repo Assist] test: add 11 unit tests for word_wrap in ui.rs

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What

Adds 11 targeted unit tests to src/ui.rs for the word_wrap function, which previously had zero test coverage despite being a non-trivial algorithm used to wrap package descriptions in the detail panel.

Why

word_wrap handles several distinct code paths:

• Word-boundary wrapping when a line exceeds max_width
• Mid-word force-break when a single token is wider than max_width
• Multi-paragraph text (newline-separated)
• Unicode/CJK double-width character handling
• The special case where max_width == 0

None of these were exercised by any test.

Tests added

Test	Covers
word_wrap_empty_string_returns_one_empty_line	empty input → [""]
word_wrap_single_word_within_limit	no-wrap fast path
word_wrap_single_line_fits_exactly	boundary: line width == max
word_wrap_wraps_at_word_boundary	2-word wrap
word_wrap_three_words_wrap_correctly	multi-word wrap
word_wrap_zero_max_returns_text_as_single_line	max_width == 0 branch
word_wrap_long_word_force_breaks	force-break closure
word_wrap_very_long_word_splits_into_multiple_lines	multi-chunk force-break
word_wrap_preserves_paragraph_breaks	newline-delimited paragraphs
word_wrap_each_line_is_within_max_width	round-trip integrity check
word_wrap_cjk_respects_display_width	CJK 2-column-wide chars

Test Status

cargo test     ✅  242 passed (was 231)
cargo fmt      ✅  no formatting issues
cargo clippy   ✅  no warnings

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