docs(user): sync-guide rebuild to today's platform; calibre guide de-API'd

sync-guide.md was 591 lines with good implementation-derived bones
(matching confidence table, universal locations, conflict flow) wrapped
around a stale device story: Android 'coming later' (the app exists and
self-registers), a deleted queue UI, invented UI (color status badges,
Auto-Resolve Future, Priority Sync buttons), placeholder support links,
an HTTPS-1.3 overclaim on LAN setups that are plain HTTP by design, and
a changelog promising the future. Rebuilt to ~140 lines, every claim
grounded: device table matches reality (web/Android/KOReader supported,
Kobo native server-complete with rollout pending), resolution
strategies as the API actually defines them (device / server /
highest_progress), offline queuing honestly scoped (Android queues;
server holds per-device queue; no dedicated queue UI today), reading
history on Progress page, RLS-era privacy wording, device limit 10
default admin-settable. Reader Sync Progress button verified.

calibre-integration.md: mostly current (sidecar-first model, Dublin
Core tables, Write-to-file section all kept); fixed the user-hostile
'POST /api/scanner/scan' instructions to point at the admin scan
controls, and dropped the yourusername placeholder repo links.

docs/user/calibre-integration.md

@@ -139,7 +139,7 @@ As long as a `metadata.opf` file exists in the folder, Bookhoard will import the
 
 **Steps**:
 1. Add the Calibre library folder in Bookhoard (Administration → Libraries → expand the library → **Folders**)
-2. Trigger a scan via the **Scanner API**, or let watch mode pick up the changed files (the File Watcher status is shown on the admin dashboard)
+2. Trigger a scan from the admin interface's scan controls, or let watch mode pick up the changed files automatically
 3. Bookhoard imports all 500 books with:
    - Correct titles and authors
    - Series information (e.g., "Harry Potter #2")
@@ -168,7 +168,7 @@ As long as a `metadata.opf` file exists in the folder, Bookhoard will import the
 **Steps**:
 1. Edit metadata in Calibre (it updates `metadata.opf`)
 2. In Bookhoard, trigger a rescan:
-   - Via the **Scanner API** (`POST /api/scanner/scan`), or
+   - Via the admin interface's scan controls, or
    - Let watch mode detect the changed files automatically (see File Watcher on the admin dashboard)
 3. Bookhoard detects updated `metadata.opf` and refreshes metadata
 
@@ -183,7 +183,7 @@ As long as a `metadata.opf` file exists in the folder, Bookhoard will import the
 **Solutions**:
 1. **Check file structure**: Ensure `metadata.opf` is in the same folder as the book file
 2. **Verify library type**: Ensure library type matches content (ebook vs. audiobook)
-3. **Force rescan**: Trigger a scan via the Scanner API to re-import all metadata (watch mode also picks up changed files automatically)
+3. **Force rescan**: Trigger a rescan from the admin interface to re-import all metadata (watch mode also picks up changed files automatically)
 4. **Check logs**: Review Bookhoard logs for parsing errors
 
 ### Incorrect Metadata
@@ -332,11 +332,10 @@ file is never touched if anything fails (temp file + atomic rename).
 - [Calibre Website](https://calibre-ebook.com/)
 - [Calibre User Manual](https://manual.calibre-ebook.com/)
 - [Calibre Forum](https://www.mobileread.com/forums/forumdisplay.php?f=166)
-- [Bookhoard GitHub](https://github.com/yourusername/bookhoard)
 
 ## Need Help?
 
 - **Documentation**: See [User Guide](user-guide.md) for general Bookhoard usage
 - **Troubleshooting**: See [Operations Guide](../operations/operations.md) for common issues
 - **Developer Docs**: See [Developer Portal](../developer/development.md) for technical details
-- **Issues**: Report bugs or request features on [GitHub Issues](https://github.com/yourusername/bookhoard/issues)
+- **Issues**: Report bugs or request features on your repository's issue tracker