Apply the dashboard's refined direction to the rest of the app:
- Items: page-title header, product thumbnail (best-price image) beside
each item name via the shared thumbSm component.
- Results: refined headers; per-item and global tables get standardized
thumbnails (global table gains a thumbnail column).
- Settings: page-title + subtitle, section headings restyled.
- Item form: page-title header.
- Shared: thumbSm component + compact thumbnail CSS variant.
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