umputun / revdiff / 24257645672

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feat: make intra-line word-diff highlighting opt-in (#88)

The feature was previously always on and clashed with certain themes
where the brighter background overlay looked confusing against the
existing add/remove backgrounds.

Now off by default, enable via --word-diff CLI flag, REVDIFF_WORD_DIFF
env var, or word-diff config key. Runtime toggle via W key. Status bar
shows a ± indicator when active. Help overlay picks up the new binding
automatically from the keymap descriptions.

Implementation: recomputeIntraRanges now gates on m.wordDiff internally
and clears m.intraRanges when disabled, so both handleFileLoaded and
toggleWordDiff just call it without duplicating the guard.

18 of 19 new or added lines in 5 files covered. (94.74%)

5603 of 6364 relevant lines covered (88.04%)

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