Peter Bowyer 4d8d3a2ca8 feat(ui): quieter plan diffs on prose edits (#603) ...

* feat(ui): atomize balanced emphasis pairs in plan diff

Before word-diffing, replace each balanced `**…**`, `__…__`, `~~…~~`,
`*…*`, `_…_` (and triples `***…***` / `___…___`) with a unique
word-char sentinel — same pattern as the existing code-span / link
atomization passes. Identical phrases pair as unchanged; different
phrases produce a single remove+add.

Fixes the "preliminary analysis" → "final analysis" demo case (⑯),
which previously orphaned the closing `**` into the unchanged tail and
rendered as literal asterisks. Now renders as one clean bold-struck →
bold-green swap.

Pair matching uses CommonMark-ish flanking rules so stray `2**3` or
intraword `my__var` / `snake_case` stay literal. Longest-first ordering
prevents single delimiters from eating the inside of a double-delim pair.

* feat(ui): coalesce adjacent diff sites separated by thin tokens

After `diffWordsWithSpace` and sentinel restoration, merge dirty runs
of ≥2 change sites separated only by thin unchanged tokens (whitespace,
commas, periods, semicolons, colons, dashes, quotes) into a single
phrase-level swap. Parens and brackets are excluded so inline links
and bracketed content stay as hard boundaries.

Turns alternating red/green word-noise (e.g. paragraph reworks with
multiple adjacent word swaps) into a readable before/after. Also
rescues the atomization edge case where wrapping a previously-plain
phrase in emphasis (`foo bar baz` → `foo **bar baz**`) would otherwise
surface as fragmented literal delimiters inside colored tags.

Single-site dirty runs pass through unchanged so isolated word swaps
keep word-level highlighting.

* feat(ui): atomize hyphenated compounds in plan diff

Hyphens between word chars (`ninety-five`, `64-byte`, `state-of-the-art`)
are semantic compound words, not two tokens. `diffWordsWithSpace` splits
on word boundaries, so without this pass `ninety-five` → `ninety-nine`
fragments into an unchanged `ninety-` prefix and a swapped `five`/`nine`
suffix — a visually noisy partial-word diff.

Added a sentinel pass that replaces infix hyphens with a word-char
marker before diffing and restores them afterwards. Runs after the
code/link/emphasis passes so hyphens inside those constructs stay
hidden. Unlike the other sentinels this one uses a fixed marker — all
hyphens restore to the same character, so uniqueness isn't needed.

Leading/trailing dashes and em-dash-like separators (dash with space on
one side) are not substituted; only true compound infixes.

2026-04-23 20:32:30 -07:00

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