docs: add sync method compatibility table to README

Shows which sync methods work in which browsers:
- Sync Code, GitHub Gist, Custom URL: all browsers
- Browser account sync: Chrome and Firefox only
- Auto-Sync Folder: Chrome only (File System Access API)

https://claude.ai/code/session_01SWSwDfMVij53bCTNSCLMwn
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Claude
2026-03-27 03:58:43 +00:00
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@@ -398,6 +398,20 @@ src/
## Sync features ## Sync features
Keep your identities, mappings, and settings in sync across browsers and devices.
### Sync methods
| Method | How it works | Chrome | Firefox | Brave | Safari |
|---|---|---|---|---|---|
| **Sync Code** | Generate a code, paste in another browser | Yes | Yes | Yes | Yes |
| **GitHub Gist** | Store settings in a private Gist (needs a free GitHub PAT) | Yes | Yes | Yes | Yes |
| **Custom URL** | Any endpoint supporting GET + PUT (WebDAV, cloud function, etc.) | Yes | Yes | Yes | Yes |
| **Browser account sync** | Automatic via your Chrome/Firefox account | Yes | Yes | No | No |
| **Auto-Sync Folder** | Pick a cloud-synced folder (Dropbox, OneDrive, etc.) | Yes | No | No | No |
Auto-Sync Folder uses the File System Access API which is only available in Chrome. All other methods work in every browser.
### Auto sync ### Auto sync
When configured, the extension automatically pushes and pulls settings on a configurable interval (5/15/30/60 minutes) using GitHub Gist or a custom URL endpoint. Local changes trigger an immediate push. When configured, the extension automatically pushes and pulls settings on a configurable interval (5/15/30/60 minutes) using GitHub Gist or a custom URL endpoint. Local changes trigger an immediate push.