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fix: use dynamic denominator in line number segment based on change type

The denominator in L:42/380 was using max(OldNum, NewNum) across all
diff lines, which could show the old file length when lines were removed
from the end. Now uses maxOld on removed lines and maxNew on
context/added lines, so the denominator always matches the file side
the cursor is on.

Note: revdiff uses -U1000000 (full file context), so the denominator
always covers the entire file — but the old/new distinction still
matters when lines are added or removed.

Also fixes 3x testifylint: assert.Empty instead of assert.Equal(t, "").