Perf: Stamp Identifier & Value

Fixes and refinements: - Results now come back in the language you chose, reasons and grade notes included. - When Perf cannot pin the year, it shows the span it could be, and duplicates and your want list match across it. - Your want list fills from a name alone, and items can be edited or removed. - Correct a stamp's name, country or year yourself, or ask Perf again from the photo already in your album. - Pick another candidate on the page review instead of discarding the tile. Stamps already in your album are marked. - A page you have scanned is kept until you mount or discard it, even if the app closes. - Add the back or a perforated edge as extra angles. It still counts as one identification. - A confident answer whose design came in several perforations offers a quick gauge check. - Pro: collection report as a PDF, with your own photographs and no values. - Learn explains overprints, varieties, repairs and how to check a watermark. - The daily allowance now resets at your own midnight.