fix(deeplink): stop malformed deep links from bricking every launch

Two related defects surfaced from a banner action pezkuwiwallet://.../open/governance:

1. ReferendumDeepLinkHandler.matches() used path.startsWith("/open/gov"), so
   "/open/governance" wrongly matched the referendum prefix and then failed with
   ReferendumIsNotSpecified (no id). Use an exact path match instead.

2. RootDeepLinkHandler only cleared the persisted pending deep link on success or
   HandlerNotFound. A link that matched a handler but failed with a terminal
   DeepLinkHandlingException stayed in SharedPreferences and replayed on every
   launch ("Referendum not found" on each open). Clear pending on terminal
   handling failures in both the fresh-intent and pending-retry paths. This also
   auto-recovers already-stuck installs on update.

feature-governance-impl/src/main/java/io/novafoundation/nova/feature_governance_impl/presentation/referenda/details/deeplink/ReferendumDeepLinkHandler.kt

@@ -31,7 +31,9 @@ class ReferendumDeepLinkHandler(
     override suspend fun matches(data: Uri): Boolean {
         val path = data.path ?: return false
 
-        return path.startsWith(ReferendumDetailsDeepLinkConfigurator.PREFIX)
+        // Exact match, not startsWith: otherwise "/open/governance" (and any "/open/gov*") would wrongly
+        // match the referendum prefix "/open/gov" and fail with ReferendumIsNotSpecified.
+        return path == ReferendumDetailsDeepLinkConfigurator.PREFIX
     }
 
     override suspend fun handleDeepLink(data: Uri) = runCatching {