fix: bitcoin receive, AIUI pointer input, electrs self-heal, OTA timeout

- LND wallet: request correct address type so receive-address generation
  no longer 400s
- AIUI/app session: on-screen pointer can click + type into app content
  (incl. app store search); "open in new tab" opens the phone browser;
  mobile credential modal centered instead of full-height
  (remote-relay.ts, AppSession.vue, AppSessionFrame.vue, AppIconGrid.vue,
  openExternal.ts, WebViewScreen.kt) + remote-relay tests
- health_monitor: electrs auto-recovers from a corrupt index and shows a
  percent/block-height progress screen while reindexing (useElectrsSync.ts)
- update.rs: drop retired tx1138 secondary mirror (one-time migration);
  longer download timeout for slow connections
- CHANGELOG: v1.7.90-alpha notes
- tests/release/run.sh: harness tweaks

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

core/archipelago/src/api/rpc/lnd/wallet.rs

@@ -13,7 +13,11 @@ impl RpcHandler {
 
         let resp = client
             .get(format!("{LND_REST_BASE_URL}/v1/newaddress"))
-            .query(&[("type", "p2wkh")])
+            // LND's REST gateway parses `type` as the AddressType enum by its
+            // proto name (or integer), NOT the lncli aliases. "p2wkh" is not a
+            // valid enum value and returns 400 "parsing field type"; the native
+            // SegWit (bech32) variant is WITNESS_PUBKEY_HASH (= 0).
+            .query(&[("type", "WITNESS_PUBKEY_HASH")])
             .header("Grpc-Metadata-macaroon", &macaroon_hex)
             .send()
             .await