chore(release): v0.11.6

Seven fixes from an audit of the stack's most fragile seams, each with a
test that fails without it. Two could take the app out entirely: an
interrupted database migration left it unable to launch at all, and an
unguarded panic at the Android JNI boundary aborted the process outright.

Frontend gates (bun run test/check/lint/format:check) were not run for
this release — node on the release machine is missing libada.so.3 and
exits 127. All changes are under src-tauri/; CI runs those gates.

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "JellyTau",
-  "version": "0.11.5",
+  "version": "0.11.6",
   "identifier": "com.dtourolle.jellytau",
   "build": {
     "beforeDevCommand": "bun run dev",