Don't let a failed index.html backup block the injection

On linuxserver/jellyfin the web folder belongs to root, so copying
index.html to index.html.sharelinks.bak threw even when index.html itself
was writable, and the ShareLink action never got injected. The backup is
best-effort now.

Bump to 1.0.7.0.

Jellyfin.Plugin.ShareLinks/meta.json

@@ -1,12 +1,12 @@
 {
   "guid": "68540b76-ee74-436d-85ff-2abc884bbea6",
   "name": "ShareLinks",
-  "version": "1.0.6.0",
+  "version": "1.0.7.0",
   "targetAbi": "10.11.0.0",
   "framework": "net9.0",
   "owner": "Franciskid",
   "overview": "Secure expiring guest-share links for Jellyfin items.",
   "description": "Adds secure, expiring share links for Jellyfin items with JSON-backed storage, token hashing, and cleanup scaffolding.",
   "category": "General",
-  "timestamp": "2026-09-18T12:00:00.0000000Z"
+  "timestamp": "2026-09-18T14:00:00.0000000Z"
 }