umputun / revdiff / 24172037370

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fix: replace all else-if patterns with switch statements

Replace 7 else-if occurrences across blame.go, theme.go, mdtoc.go,
filetree.go, diffnav.go, and annotate.go with switch statements or
split if blocks. Fix stale placeholderContents comment referencing
deleted openFileForReading. Update plan with post-review cleanup task.

26 of 27 new or added lines in 6 files covered. (96.3%)

5100 of 5815 relevant lines covered (87.7%)

406.27 hits per line