Generic fixes (#1619)

* update fee rates

* periodically update fees

* minor enhancements

* minor enhancements

* some improvements
add solana node

* handle empty hex as null

* minor improvement

* fix imports

* fix app hanging on splash screen

* update app versions
temporarily disable sign/verify for hardware wallets

cw_wownero/pubspec.lock

@@ -295,18 +295,18 @@ packages:
     dependency: transitive
     description:
       name: hashlib
-      sha256: "71bf102329ddb8e50c8a995ee4645ae7f1728bb65e575c17196b4d8262121a96"
+      sha256: d41795742c10947930630118c6836608deeb9047cd05aee32d2baeb697afd66a
       url: "https://pub.dev"
     source: hosted
-    version: "1.12.0"
+    version: "1.19.2"
   hashlib_codecs:
     dependency: transitive
     description:
       name: hashlib_codecs
-      sha256: "49e2a471f74b15f1854263e58c2ac11f2b631b5b12c836f9708a35397d36d626"
+      sha256: "2b570061f5a4b378425be28a576c1e11783450355ad4345a19f606ff3d96db0f"
       url: "https://pub.dev"
     source: hosted
-    version: "2.2.0"
+    version: "2.5.0"
   hive:
     dependency: transitive
     description:
@@ -567,12 +567,11 @@ packages:
   polyseed:
     dependency: "direct main"
     description:
-      path: "."
-      ref: f9adc68dbf879fefadeae8e86d1c2983f5a2cc3f
-      resolved-ref: f9adc68dbf879fefadeae8e86d1c2983f5a2cc3f
-      url: "https://github.com/mrcyjanek/polyseed_dart"
-    source: git
-    version: "0.0.5"
+      name: polyseed
+      sha256: "11d4dbee409db053c5e9cd77382b2f5115f43fc2529158a826a96f3ba505d770"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.0.6"
   pool:
     dependency: transitive
     description:

cw_wownero/pubspec.yaml

@@ -19,10 +19,7 @@ dependencies:
   flutter_mobx: ^2.0.6+1
   intl: ^0.18.0
   encrypt: ^5.0.1
-  polyseed:
-    git:
-      url: https://github.com/mrcyjanek/polyseed_dart
-      ref: f9adc68dbf879fefadeae8e86d1c2983f5a2cc3f
+  polyseed: ^0.0.6
   cw_core:
     path: ../cw_core
   monero: