feat: initial working version of project manager

app/src/lib/project-manager/ProjectManager.svelte

@@ -0,0 +1,85 @@
+<script lang="ts">
+  import type { Graph } from "$lib/types";
+  import { defaultPlant } from "$lib/graph-templates";
+  import type { ProjectManager } from "./project-manager.svelte";
+
+  const { projectManager } = $props<{ projectManager: ProjectManager }>();
+
+  let showNewProject = $state(false);
+  let newProjectName = $state("");
+
+  function handleCreate() {
+    projectManager.handleCreateProject(
+      defaultPlant as unknown as Graph,
+      newProjectName,
+    );
+    newProjectName = "";
+    showNewProject = false;
+  }
+</script>
+
+<header
+  class="flex justify-between px-4 h-[70px] border-b-1 border-[var(--outline)] items-center"
+>
+  <h3>Project</h3>
+  <button
+    class="px-3 py-1 bg-[var(--layer-0)] rounded"
+    onclick={() => (showNewProject = !showNewProject)}
+  >
+    New
+  </button>
+</header>
+
+{#if showNewProject}
+  <div
+    class="flex justify-between px-4 h-[70px] border-b-1 border-[var(--outline)] items-center gap-2"
+  >
+    <input
+      type="text"
+      bind:value={newProjectName}
+      placeholder="Project name"
+      class="flex-1 min-w-0 px-2 py-2 bg-gray-800 border border-gray-700 rounded"
+      onkeydown={(e) => e.key === "Enter" && handleCreate()}
+    />
+    <button class="cursor-pointer" onclick={() => handleCreate()}>
+      Create
+    </button>
+  </div>
+{/if}
+
+<div class="p-4 text-white min-h-screen">
+  {#if projectManager.loading}
+    <p>Loading...</p>
+  {/if}
+
+  <ul class="space-y-2">
+    {#each projectManager.projects as project (project.id)}
+      <li>
+        <div
+          class="w-full text-left px-3 py-2 rounded cursor-pointer {projectManager
+            .activeProjectId.value === project.id
+            ? 'bg-blue-600'
+            : 'bg-gray-800 hover:bg-gray-700'}"
+          onclick={() => projectManager.handleSelectProject(project.id!)}
+          role="button"
+          tabindex="0"
+          onkeydown={(e) =>
+            e.key === "Enter" &&
+            projectManager.handleSelectProject(project.id!)}
+        >
+          <div class="flex justify-between items-center">
+            <span>{project.meta?.title || "Untitled"}</span>
+            <button
+              class="text-red-400 hover:text-red-300"
+              onclick={() => {
+                projectManager.handleDeleteProject(project.id!);
+              }}
+            >
+              ×
+            </button>
+          </div>
+        </div>
+      </li>
+    {/each}
+  </ul>
+</div>