Hide zero-value sidebar file stats

[benvinegar]

Summary

• hide zero-value +0 and -0 badges in the file list sidebar
• keep sidebar stats right-aligned when a file only has additions or only has deletions
• add coverage for addition-only, deletion-only, and zero-delta sidebar entries

Testing

• bun run typecheck
• bun test
• bun run test:tty-smoke

[greptile-apps]

Greptile Summary

This PR hides zero-value +0 and -0 badges in the sidebar file list by introducing a formatSidebarStat helper that returns null for zero values, and updating sidebarEntryStats to filter out null entries. Right-alignment is preserved for single-side delta files through justifyContent: flex-end on the stats container.

• Adds formatSidebarStat in files.ts returning null when a stat value is zero, keeping the sidebar clean of noise
• Updates FileListEntry interface: additionsText and deletionsText are now string | null
• sidebarEntryStatsWidth and sidebarEntryStats handle null values correctly; files with all-zero stats receive a zero statsWidth and no stats section renders at all
• New unit tests in files.test.ts cover addition-only, deletion-only, and zero-delta (rename-only) sidebar entries
• Integration test in ui-components.test.tsx confirms +0/-0 never appear and valid stats (+2 -1, +5, -3) render correctly

Confidence Score: 5/5

This PR is safe to merge — a focused, well-tested UI polish change with no logic regressions.

All changes are additive and well-covered by new tests. Null propagation is handled correctly throughout the stack from formatSidebarStat through FileListEntry → sidebarEntryStats → sidebarEntryStatsWidth → SidebarPane statsWidth → FileListItem rendering. There are no P0 or P1 issues.

No files require special attention.

Important Files Changed

Filename	Overview
src/ui/lib/files.ts	Adds formatSidebarStat helper returning null for zero-value stats; updates FileListEntry types and buildSidebarEntries accordingly
src/ui/components/panes/FileListItem.tsx	Unchanged rendering logic; correctly consumes null-aware sidebarEntryStats output via truthiness filtering
src/ui/components/panes/SidebarPane.tsx	statsWidth computation handles all-zero case cleanly; right-alignment via justifyContent: flex-end is preserved
src/ui/lib/files.test.ts	New unit tests cover addition-only, deletion-only, and zero-delta entries for buildSidebarEntries
src/ui/components/ui-components.test.tsx	Integration test verifies +0/-0 never render and valid delta badges (+2 -1, +5, -3) display correctly

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[buildSidebarEntries] --> B["formatSidebarStat('+', additions)"]
    A --> C["formatSidebarStat('-', deletions)"]
    B --> D{value > 0?}
    C --> D
    D -->|yes| E["+N / -N string"]
    D -->|no| F[null]
    E --> G["FileListEntry\nadditionsText / deletionsText"]
    F --> G
    G --> H[sidebarEntryStats]
    H --> I{additionsText truthy?}
    H --> J{deletionsText truthy?}
    I -->|yes| K[push addition badge]
    J -->|yes| L[push deletion badge]
    I -->|no| M[skip]
    J -->|no| M
    K --> N[sidebarEntryStatsWidth]
    L --> N
    N --> O["SidebarPane\nstatsWidth = max across entries"]
    O --> P["FileListItem\nflex-end right-aligned stats section"]

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