Problem Solving & Design 68

The app goes well beyond the brief with search, mood filtering, export/import, a statistics panel, and a configurable target duration, all cohesively integrated into a single-page backstage tool.

• +The SetLengthPanel shows a colour-coded progress bar that shifts from green to yellow at 90% of target and to red when over, giving the band an at-a-glance status.
• +Import is validated against a Zod schema before being applied, protecting the setlist from corrupt or mismatched JSON files.
• +Destructive actions (clear all, delete song, import-replace) are guarded by a confirm dialog with keyboard-accessible Escape cancellation.
• -Song cards animate during an active drag via the CSS transform and transition values from useSortable, but there is no entry/exit animation when songs are added or removed from the list.

Completeness 92

All core brief features are implemented end-to-end, with the only gap being that internal errors (e.g. localStorage write failures) are logged to the console rather than surfaced to the user.

• +The localStorage hook catches corrupt data on read and falls back to the initial value gracefully, preventing a blank crash on startup.
• +The add-song form validates both title and duration with inline error messages before any song reaches state.
• +An empty state component is shown when no songs exist, giving clear onboarding guidance.
• -localStorage write failures are only logged with console.warn and never shown to the user, so a full storage quota error would silently discard changes.

Technical Craft 81

The codebase is well-structured with clear module boundaries, typed interfaces, and consistent use of Zod validation, though it ships with no automated tests.

• +Duration input accepts both M:SS and plain-minute formats, with the parser rejecting seconds outside 0–59 and returning NaN for invalid input.
• +The drag-and-drop activation requires a minimum 8px pointer movement, preventing accidental reorders on tap or click.
• -There are no automated tests of any kind — no unit tests for the duration parser, the localStorage hook, or any component — leaving regressions undetected.