[#372] Improve scrolling on Onboarding

* [#372] Improve scrolling on Onboarding

- Closes #372
- All screens were checked
- The Onboarding screen behavior on very small screens improved
- Tested with Split screen OS feature to emulate a very small screen

* Fixed status and navigation bars height

ui-design-lib/src/main/java/co/electriccoin/zcash/ui/design/util/ScreenHeight.kt

@@ -31,10 +31,26 @@ fun screenHeight(cacheKey: Any = true): ScreenHeight {
             val contentHeightPx = with(density) { configuration.screenHeightDp.dp.roundToPx() }
             Twig.debug { "Screen content height in pixels: $contentHeightPx" }
 
-            val statusBarHeight = statusBars.getTop(density).dp
+            // TODO [#1382]: Analyse zero status and navigation bars height
+            // TODO [#1382]: https://github.com/Electric-Coin-Company/zashi-android/issues/1382
+            val statusBarHeight =
+                statusBars.getTop(density).dp.run {
+                    if (value <= 0f) {
+                        48.dp
+                    } else {
+                        this
+                    }
+                }
             Twig.debug { "Status bar height: $statusBarHeight" }
 
-            val navigationBarHeight = navigationBars.getBottom(density).dp
+            val navigationBarHeight =
+                navigationBars.getBottom(density).dp.run {
+                    if (value <= 0f) {
+                        88.dp
+                    } else {
+                        this
+                    }
+                }
             Twig.debug { "Navigation bar height: $navigationBarHeight" }
 
             val contentHeight = (contentHeightPx / density.density.roundToInt()).dp
@@ -56,7 +72,15 @@ data class ScreenHeight(
     val systemStatusBarHeight: Dp,
     val systemNavigationBarHeight: Dp
 ) {
-    fun overallScreenHeight() = contentHeight + systemBarsHeight()
+    fun overallScreenHeight(): Dp {
+        return (contentHeight + systemBarsHeight()).also {
+            Twig.debug { "Screen overall height: $it" }
+        }
+    }
 
-    fun systemBarsHeight() = systemStatusBarHeight + systemNavigationBarHeight
+    fun systemBarsHeight(): Dp {
+        return (systemStatusBarHeight + systemNavigationBarHeight).also {
+            Twig.debug { "System bars height: $this" }
+        }
+    }
 }

ui-lib/src/main/java/co/electriccoin/zcash/ui/screen/onboarding/view/OnboardingView.kt

@@ -115,7 +115,7 @@ fun ShortOnboarding(
                         Modifier
                             .padding(
                                 top = paddingValues.calculateTopPadding() + ZcashTheme.dimens.spacingHuge,
-                                bottom = paddingValues.calculateBottomPadding(),
+                                bottom = paddingValues.calculateBottomPadding() + ZcashTheme.dimens.spacingDefault,
                                 start = ZcashTheme.dimens.screenHorizontalSpacingBig,
                                 end = ZcashTheme.dimens.screenHorizontalSpacingBig
                             )
@@ -168,7 +168,7 @@ private fun OnboardingMainContent(
             },
         )
         Column(
-            modifier = modifier,
+            modifier = modifier.then(Modifier.verticalScroll(rememberScrollState())),
             horizontalAlignment = Alignment.CenterHorizontally
         ) {
             Image(
@@ -205,7 +205,7 @@ private fun OnboardingMainContent(
                 modifier = Modifier.fillMaxWidth()
             )
 
-            Spacer(modifier = Modifier.height(ZcashTheme.dimens.spacingLarge))
+            Spacer(modifier = Modifier.height(ZcashTheme.dimens.spacingDefault))
 
             SecondaryButton(
                 onImportWallet,
@@ -242,7 +242,7 @@ fun AnimatedImage(
                     modifier =
                         Modifier
                             .fillMaxHeight()
-                            .height(screenHeight.overallScreenHeight()),
+                            .height(screenHeight.overallScreenHeight() + ZcashTheme.dimens.spacingHuge),
                     contentDescription = null
                 )
                 Image(