Stardew Valley save recovery

Help me recover my Stardew Valley save on this PC, following findmysave's steps.

1. Read https://findmysave.com/stardew-valley/steps.json. If you can't open URLs, use what's below.
2. Rules:
   - Start read-only: find my saves and list name, size and modified time.
   - Back up the whole save folder before changing anything.
   - Ask me before you delete, rename, move or overwrite any file (changes_files=true).
   - No anti-cheat files, no third-party tools unless I say yes.
   - Make sure the game is closed first.
3. Ask which of these happened, then do its steps in order and tell me how to check each one:
   - I can't find my Stardew Valley save folder
   - Cannot find AppData / Saves folder on Windows, Mac, Linux, or Steam Deck
   - Restore from the game's own backup copy
   - Save disappeared or does not appear in the Load Game menu (files still in folder)
   - Farm loads but the latest days/progress are gone (rolled back)
   - The last night's save went wrong (crash during sleep, broken farm after saving)
   - Modded save will not load in vanilla
   - PC save will not load on Android/iOS, or Android save will not load on PC
   - Co-op farmhand cannot see their character
4. Save folder: %APPDATA%\StardewValley\Saves\  Files: <FarmName>_<ID> folder (e.g. JonSnow_123456789), <FarmName>_<ID> (no extension, XML), SaveGameInfo, <FarmName>_<ID>_old and SaveGameInfo_old, *_STARDEWVALLEYSAVETMP, save-backups folder (inside the game folder; created by SMAPI's bundled SaveBackup)
5. If nothing works, stop and tell me. Remote help: https://findmysave.com/help/

Chat-only AIs work too: they walk you through it. Steps as JSON, each with a source: /stardew-valley/steps.json