feat(sync): publish hostname and quiesce sync for backup

- getSyncStatus: fire-and-forget push device hostname when missing so
  linked peers see names after opening Sync page
- Backup/restore: close sync (corestore) before copy/extract so autopass
  data is consistent; backup includes autopass/ and autopass-identity.json
- Installer: preserve sync data on re-run (comments and messages)
- Docs: BACKUP.md sync-in-backup and pause behaviour; SYNC.md backups
  include sync data

scripts/install.ps1

@@ -25,13 +25,15 @@ Write-Host "Stopping any running native host..."
 Get-Process | Where-Object { $_.Path -like "*holesail-browser-host*" } | Stop-Process -Force -ErrorAction SilentlyContinue
 
 # ── Preserve user data from any previous installation ─────────────────────────
+# holesail-browser-storage includes state.json, backups/, and when linked:
+# autopass/ and autopass-identity.json (sync data). Preserving the whole dir keeps sync identity across re-runs.
 $StashDir     = Join-Path $env:TEMP "holesail-browser-stash-$([System.Guid]::NewGuid().ToString('N'))"
 $StashStorage = Join-Path $StashDir "holesail-browser-storage"
 $StashCerts   = Join-Path $StashDir "holesail-browser-certs"
 $HadPrevious  = $false
 
 if (Test-Path $InstallDir) {
-  Write-Host "Preserving existing settings and certificates..."
+  Write-Host "Preserving existing settings, certificates, and sync data..."
   New-Item -ItemType Directory -Path $StashDir -Force | Out-Null
   $StorageSrc = Join-Path $InstallDir "holesail-browser-storage"
   $CertsSrc   = Join-Path $InstallDir "holesail-browser-certs"
@@ -79,7 +81,7 @@ Write-Host "  Binary: $HostBin"
 
 # ── Restore preserved user data ────────────────────────────────────────────────
 if ($HadPrevious) {
-  Write-Host "Restoring settings and certificates..."
+  Write-Host "Restoring settings, certificates, and sync data..."
   if (Test-Path $StashStorage) {
     Copy-Item $StashStorage (Join-Path $InstallDir "holesail-browser-storage") -Recurse -Force
     Write-Host "  Restored: holesail-browser-storage"

scripts/install.sh

@@ -40,13 +40,15 @@ pkill -f "holesail-browser/native-host/index.mjs" 2>/dev/null || true
 pkill -f "holesail-browser-host" 2>/dev/null || true
 
 # ── Preserve user data from any previous installation ─────────────────────────
+# holesail-browser-storage includes state.json, backups/, and when linked:
+# autopass/ and autopass-identity.json (sync data). Preserving the whole dir keeps sync identity across re-runs.
 STASH_DIR="$(mktemp -d)"
 STASH_STORAGE="${STASH_DIR}/holesail-browser-storage"
 STASH_CERTS="${STASH_DIR}/holesail-browser-certs"
 HAD_PREVIOUS=false
 
 if [[ -d "$INSTALL_DIR" ]]; then
-  echo "Preserving existing settings and certificates..."
+  echo "Preserving existing settings, certificates, and sync data..."
   [[ -d "${INSTALL_DIR}/holesail-browser-storage" ]] && \
     cp -a "${INSTALL_DIR}/holesail-browser-storage" "$STASH_STORAGE" && \
     echo "  Saved: holesail-browser-storage"
@@ -89,7 +91,7 @@ chmod +x "$HOST_BIN"
 
 # ── Restore preserved user data ────────────────────────────────────────────────
 if [[ "$HAD_PREVIOUS" == "true" ]]; then
-  echo "Restoring settings and certificates..."
+  echo "Restoring settings, certificates, and sync data..."
   [[ -d "$STASH_STORAGE" ]] && \
     cp -a "$STASH_STORAGE" "${INSTALL_DIR}/holesail-browser-storage" && \
     echo "  Restored: holesail-browser-storage"