add recalling of last project when navigating out from and into quest log.

svelte-ui/src/components/QuestLog.svelte

@@ -1,3 +1,7 @@
+<script lang="ts" context="module">
+  let lastQuest = "";
+</script>
+
 <script lang="ts">
   import type { ProjectResult } from "../models/project";
   import selectionStore from "../stores/selection";
@@ -26,12 +30,25 @@
 
   $: {
     if (project === null && projects.length > 0) {
-      project = expiringProjects[0] || activeProjects[0] || completedProjects[0] || null;
+      if (lastQuest !== "") {
+        project = projects.find(p => p.id === lastQuest) || null;
+      }
+
+      if (project === null) {
+        project = expiringProjects[0] || activeProjects[0] || completedProjects[0] || null;
+      }
+      
       if (project !== null) {
         selectionStore.change("hash", project.id);
       }
     }
   }
+
+  $: {
+    if ($selectionStore.hash.startsWith("P")) {
+      lastQuest = $selectionStore.hash;
+    }
+  }
 </script>
 
 <div class="quest-log">