chore(EnterSeedPhrase): improve the SB page

- add a convenience Paste button
- make it possible to validate the seedphrase

storybook/pages/EnterSeedPhrasePage.qml

@@ -1,14 +1,53 @@
 import QtQuick 2.15
+import QtQuick.Controls 2.15
 
 import shared.panels 1.0
 
 import Storybook 1.0
 
-
 Item {
+    QtObject {
+        id: mockDriver
+
+        readonly property var seedWords: ["apple", "banana", "cat", "cow", "catalog", "catch", "category", "cattle", "dog", "elephant", "fish", "grape"]
+
+        function isSeedPhraseValid(mnemonic: string) {
+            return mnemonic === seedWords.join(" ")
+        }
+    }
+
     EnterSeedPhrase {
+        id: panel
         anchors.centerIn: parent
+        isSeedPhraseValid: mockDriver.isSeedPhraseValid
+    }
+
+    Row {
+        anchors.bottom: parent.bottom
+        anchors.right: parent.right
+        anchors.margins: 10
+        spacing: 8
+
+        Label {
+            anchors.verticalCenter: parent.verticalCenter
+            text: "Valid: %1".arg(panel.seedPhraseIsValid ? "yes" : "no")
+        }
+        Button {
+            text: "Paste seed phrase"
+            focusPolicy: Qt.NoFocus
+            onClicked: {
+                for (let i = 1;; i++) {
+                    const input = StorybookUtils.findChild(panel, `enterSeedPhraseInputField${i}`)
+
+                    if (input === null)
+                        break
+
+                    input.text = mockDriver.seedWords[i-1]
+                }
+            }
+        }
     }
 }
 
-// category: Panels
+// category: Panels
+// status: good