feat: Add "Planner" button to Navbar component

The code changes include adding a "Planner" button to the Navbar component. This button allows users to navigate to the Planner page. The changes involve modifying the Navbar component in the src/lib/components/Navbar.svelte file.

src/lib/components/Navbar.svelte

@@ -78,6 +78,11 @@
       <button class="btn btn-primary my-2 md:my-0 md:mr-4" on:click={goToLog}
         >My Log</button
       >
+      <button
+        class="btn btn-primary my-2 md:my-0 md:mr-4"
+        on:click={() => goto("/planner")}>Planner</button
+      >
+
       <!-- <button
         class="btn btn-primary my-2 md:my-0 md:mr-4"
         on:click={() => goto("/planner")}>Planner</button