fix: SAF delete crash, getFileMetadata drop-first, MKCOL before upload

- LocalAccessor.Saf.delete() now uses docIdCache (same as openInputStream)
  and catches IllegalStateException from DocumentsContract.deleteDocument
  instead of propagating it through awaitAll() and crashing the whole sync
- WebDavProvider.getFileMetadata() passes dropFirst=false to parsePropfind
  since Depth:0 returns exactly 1 result (the file); drop(1) was discarding it
- SyncEngine.performSync() calls ensureRemoteDirs() before each upload so
  MKCOL is issued for any missing parent directories (405=exists is success)
- Bump version to 1.0.11 (code 12)

Verified against live Nextcloud: baseline ↑0 ↓0 ✗0, upload detection ↑1 ↓0 ✗0,
download detection ↑0 ↓1 ✗0.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/main/kotlin/com/syncflow/data/providers/webdav/WebDavProvider.kt

@@ -132,7 +132,10 @@ open class WebDavProvider(protected val account: CloudAccount) : CloudProvider {
             val req = Request.Builder().url(url(remotePath)).method("PROPFIND", PROPFIND_BODY).header("Depth", "0").build()
             client.newCall(req).execute().use { resp ->
                 if (resp.code != 207) throw Exception("HTTP ${resp.code}")
-                parsePropfind(resp.body?.string() ?: "", remotePath.substringBeforeLast('/'))
+                // Depth:0 returns exactly the requested resource as the single response entry.
+                // parsePropfind normally drops the first entry (the parent dir) for Depth:1
+                // directory listings, so pass dropFirst=false here.
+                parsePropfind(resp.body?.string() ?: "", remotePath.substringBeforeLast('/'), dropFirst = false)
                     .firstOrNull() ?: throw Exception("File not found")
             }
         }
@@ -153,7 +156,7 @@ open class WebDavProvider(protected val account: CloudAccount) : CloudProvider {
 
     protected fun url(path: String) = "$baseUrl/${path.trimStart('/')}"
 
-    private fun parsePropfind(xml: String, parentPath: String): List<RemoteFile> {
+    private fun parsePropfind(xml: String, parentPath: String, dropFirst: Boolean = true): List<RemoteFile> {
         val results = mutableListOf<RemoteFile>()
         try {
             val factory = XmlPullParserFactory.newInstance()
@@ -192,7 +195,7 @@ open class WebDavProvider(protected val account: CloudAccount) : CloudProvider {
                 eventType = parser.next()
             }
         } catch (_: Exception) {}
-        return results.drop(1) // drop the parent folder itself
+        return if (dropFirst) results.drop(1) else results
     }
 
     private fun parseHttpDate(value: String): Instant = try {