Add dark logo for navbar and open projects on single click

- Add logo-dark.png (logo8, white outlines) for dark navbar background
- Switch navbar brand image to use dark variant
- Change project list single-click to directly open project instead of
  just selecting it (double-click still works too)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: eprifti

frontend/public/logo-dark.png

@@ -2,7 +2,7 @@
   <div id="app">
     <nav class="navbar">
       <router-link to="/" class="brand">
-        <img src="/logo.png" alt="PredomicsApp" class="brand-logo" />
+        <img src="/logo-dark.png" alt="PredomicsApp" class="brand-logo" />
         PredomicsApp
       </router-link>
       <div class="nav-links">

frontend/src/App.vue

@@ -39,7 +39,7 @@
         :key="p.project_id"
         :project="p"
         :selected="store.selectedId === p.project_id"
-        @select="store.selectedId = p.project_id"
+        @select="openProject(p.project_id)"
         @open="openProject(p.project_id)"
       />
 
@@ -51,7 +51,7 @@
         :project="sp"
         :selected="store.selectedId === sp.project_id"
         :is-shared="true"
-        @select="store.selectedId = sp.project_id"
+        @select="openProject(sp.project_id)"
         @open="openProject(sp.project_id)"
       />