feat: sync chains config, rebrand assets icon, update onboarding image

- Sync chains.json from pezkuwi-wallet-utils (staking on Asset Hub)
- Replace Nova star with Nevruz fire icon on Assets bottom nav tab
- Update onboarding welcome background image (all DPI variants)
- Fix build URLs to point to pezkuwi-wallet-utils GitHub raw
- Update staking reward calculator and era computation
- Bump version code to 159

common/src/main/res/drawable/ic_nav_bar_assets_active.xml

@@ -7,7 +7,7 @@
     <clip-path
         android:pathData="M0,0h24v24h-24z"/>
     <path
-        android:pathData="M24,12V12.315C22.039,12.625 17.834,13.352 15.767,14.142C15.029,14.426 14.442,15.008 14.153,15.74C13.357,17.797 12.625,22.028 12.315,24H11.685C11.37,22.034 10.643,17.802 9.847,15.74C9.558,15.003 8.971,14.42 8.233,14.142C6.166,13.352 1.961,12.625 0,12.315V11.685C1.961,11.375 6.166,10.648 8.233,9.858C8.971,9.574 9.558,8.992 9.847,8.26C10.643,6.203 11.375,1.972 11.685,0H12.315C12.63,1.966 13.357,6.198 14.153,8.26C14.442,8.997 15.029,9.58 15.767,9.858C17.834,10.648 22.039,11.375 24,11.685V12Z"
+        android:pathData="M12,2.3C13.4,5.4 16.4,7.3 17.6,10.5C18.8,13.8 17.6,17.1 16.4,19C15.2,20.9 13.4,22.3 12,22.7C10.6,22.3 8.8,20.9 7.6,19C6.4,17.1 5.2,13.8 6.4,10.5C7.6,7.3 10.6,5.4 12,2.3Z"
         android:fillColor="#1F78FF"/>
   </group>
 </vector>

common/src/main/res/drawable/ic_nav_bar_assets_inactive.xml

@@ -7,7 +7,7 @@
     <clip-path
         android:pathData="M0,0h24v24h-24z"/>
     <path
-        android:pathData="M14.153,15.74C14.442,15.008 15.029,14.426 15.767,14.142C17.333,13.543 20.125,12.981 22.24,12.609C22.869,12.498 23.439,12.405 23.898,12.331C23.933,12.326 23.967,12.321 24,12.315V11.685C23.967,11.679 23.933,11.674 23.898,11.669C23.439,11.595 22.869,11.502 22.24,11.391C20.125,11.019 17.333,10.457 15.767,9.858C15.029,9.58 14.442,8.997 14.153,8.26C13.549,6.695 12.985,3.882 12.611,1.757C12.5,1.128 12.405,0.56 12.332,0.102C12.326,0.067 12.321,0.033 12.315,0H11.685C11.679,0.034 11.674,0.068 11.668,0.104C11.596,0.562 11.502,1.13 11.392,1.758C11.018,3.885 10.451,6.699 9.847,8.26C9.558,8.992 8.971,9.574 8.233,9.858C6.667,10.457 3.875,11.019 1.76,11.391C1.131,11.502 0.561,11.595 0.102,11.669C0.067,11.674 0.033,11.679 0,11.685V12.315C0.033,12.321 0.067,12.326 0.102,12.331C0.561,12.405 1.131,12.498 1.76,12.609C3.875,12.981 6.667,13.543 8.233,14.142C8.971,14.42 9.558,15.003 9.847,15.74C10.451,17.305 11.015,20.118 11.389,22.243C11.5,22.872 11.595,23.44 11.668,23.898C11.674,23.933 11.679,23.967 11.685,24H12.315C12.321,23.966 12.326,23.931 12.332,23.896C12.404,23.438 12.498,22.87 12.608,22.243C12.982,20.115 13.549,17.301 14.153,15.74ZM11.999,19.08C12.304,17.664 12.659,16.275 13.034,15.307L13.037,15.3C13.449,14.254 14.286,13.426 15.337,13.022L15.338,13.022C16.304,12.652 17.678,12.302 19.079,12C17.679,11.698 16.307,11.348 15.341,10.979C14.284,10.58 13.447,9.748 13.036,8.697L13.034,8.692C12.659,7.723 12.306,6.334 12.001,4.92C11.696,6.336 11.341,7.725 10.966,8.693L10.963,8.7C10.551,9.746 9.714,10.574 8.664,10.978L8.662,10.978C7.696,11.348 6.322,11.698 4.921,12C6.321,12.302 7.693,12.652 8.659,13.021C9.716,13.42 10.553,14.252 10.964,15.303L10.966,15.308C11.341,16.277 11.694,17.666 11.999,19.08Z"
+        android:pathData="M12,2.3C13.4,5.4 16.4,7.3 17.6,10.5C18.8,13.8 17.6,17.1 16.4,19C15.2,20.9 13.4,22.3 12,22.7C10.6,22.3 8.8,20.9 7.6,19C6.4,17.1 5.2,13.8 6.4,10.5C7.6,7.3 10.6,5.4 12,2.3ZM12,5.5C12.7,7.6 14.7,8.9 15.3,11.2C15.9,13.5 15.3,15.5 14.5,17C13.7,18.5 13,19.6 12,20.1C11,19.6 10.3,18.5 9.5,17C8.7,15.5 8.1,13.5 8.7,11.2C9.3,8.9 11.3,7.6 12,5.5Z"
         android:fillColor="#ffffff"
         android:fillAlpha="0.4"
         android:fillType="evenOdd"/>