feat(frontend): add instance creation wizard

- Create multi-step InstanceCreationModal with version and mod loader selection
- Step 1: Instance name input
- Step 2: Minecraft version selection with search and filtering
- Step 3: Mod loader choice (vanilla/Fabric/Forge) with version selection
- Automatically installs vanilla version + mod loader during creation
- Wire new modal to InstancesView, replace old simple creation dialog
- Remove unused confirmCreate function

This wizard integrates version management into instance creation workflow,
streamlining the user experience by combining instance setup and version
installation into a single guided process.

2 files changed, 487 insertions, 41 deletions

diff --git a/ui/src/components/InstanceCreationModal.svelte b/ui/src/components/InstanceCreationModal.svelte
new file mode 100644
index 0000000..c54cb98
--- /dev/null
+++ b/ui/src/components/InstanceCreationModal.svelte
@@ -0,0 +1,485 @@
+<script lang="ts">
+  import { invoke } from "@tauri-apps/api/core";
+  import { X, ChevronLeft, ChevronRight, Loader2, Search } from "lucide-svelte";
+  import { instancesState } from "../stores/instances.svelte";
+  import { gameState } from "../stores/game.svelte";
+  import type { Version, Instance, FabricLoaderEntry, ForgeVersion } from "../types";
+
+  interface Props {
+    isOpen: boolean;
+    onClose: () => void;
+  }
+
+  let { isOpen, onClose }: Props = $props();
+
+  // Wizard steps: 1 = Name, 2 = Version, 3 = Mod Loader
+  let currentStep = $state(1);
+  let instanceName = $state("");
+  let selectedVersion = $state<Version | null>(null);
+  let modLoaderType = $state<"vanilla" | "fabric" | "forge">("vanilla");
+  let selectedFabricLoader = $state("");
+  let selectedForgeLoader = $state("");
+  let creating = $state(false);
+  let errorMessage = $state("");
+
+  // Mod loader lists
+  let fabricLoaders = $state<FabricLoaderEntry[]>([]);
+  let forgeVersions = $state<ForgeVersion[]>([]);
+  let loadingLoaders = $state(false);
+
+  // Version list filtering
+  let versionSearch = $state("");
+  let versionFilter = $state<"all" | "release" | "snapshot">("release");
+
+  // Filtered versions
+  let filteredVersions = $derived(() => {
+    let versions = gameState.versions || [];
+    
+    // Filter by type
+    if (versionFilter !== "all") {
+      versions = versions.filter((v) => v.type === versionFilter);
+    }
+
+    // Search filter
+    if (versionSearch) {
+      versions = versions.filter((v) =>
+        v.id.toLowerCase().includes(versionSearch.toLowerCase())
+      );
+    }
+
+    return versions;
+  });
+
+  // Fetch mod loaders when entering step 3
+  async function loadModLoaders() {
+    if (!selectedVersion) return;
+    
+    loadingLoaders = true;
+    try {
+      if (modLoaderType === "fabric") {
+        const loaders = await invoke<FabricLoaderEntry[]>("get_fabric_loaders_for_version", {
+          gameVersion: selectedVersion.id,
+        });
+        fabricLoaders = loaders;
+        if (loaders.length > 0) {
+          selectedFabricLoader = loaders[0].loader.version;
+        }
+      } else if (modLoaderType === "forge") {
+        const versions = await invoke<ForgeVersion[]>("get_forge_versions_for_game", {
+          gameVersion: selectedVersion.id,
+        });
+        forgeVersions = versions;
+        if (versions.length > 0) {
+          selectedForgeLoader = versions[0].version;
+        }
+      }
+    } catch (err) {
+      errorMessage = `Failed to load ${modLoaderType} versions: ${err}`;
+    } finally {
+      loadingLoaders = false;
+    }
+  }
+
+  // Watch for mod loader type changes and load loaders
+  $effect(() => {
+    if (currentStep === 3 && modLoaderType !== "vanilla") {
+      loadModLoaders();
+    }
+  });
+
+  // Reset modal state
+  function resetModal() {
+    currentStep = 1;
+    instanceName = "";
+    selectedVersion = null;
+    modLoaderType = "vanilla";
+    selectedFabricLoader = "";
+    selectedForgeLoader = "";
+    creating = false;
+    errorMessage = "";
+    versionSearch = "";
+    versionFilter = "release";
+  }
+
+  function handleClose() {
+    if (!creating) {
+      resetModal();
+      onClose();
+    }
+  }
+
+  function goToStep(step: number) {
+    errorMessage = "";
+    currentStep = step;
+  }
+
+  function validateStep1() {
+    if (!instanceName.trim()) {
+      errorMessage = "Please enter an instance name";
+      return false;
+    }
+    return true;
+  }
+
+  function validateStep2() {
+    if (!selectedVersion) {
+      errorMessage = "Please select a Minecraft version";
+      return false;
+    }
+    return true;
+  }
+
+  async function handleNext() {
+    errorMessage = "";
+    
+    if (currentStep === 1) {
+      if (validateStep1()) {
+        goToStep(2);
+      }
+    } else if (currentStep === 2) {
+      if (validateStep2()) {
+        goToStep(3);
+      }
+    }
+  }
+
+  async function handleCreate() {
+    if (!validateStep1() || !validateStep2()) return;
+
+    creating = true;
+    errorMessage = "";
+
+    try {
+      // Step 1: Create instance
+      const instance: Instance = await invoke("create_instance", {
+        name: instanceName.trim(),
+      });
+
+      // Step 2: Install vanilla version
+      await invoke("install_version", {
+        instanceId: instance.id,
+        versionId: selectedVersion!.id,
+      });
+
+      // Step 3: Install mod loader if selected
+      if (modLoaderType === "fabric" && selectedFabricLoader) {
+        await invoke("install_fabric", {
+          instanceId: instance.id,
+          gameVersion: selectedVersion!.id,
+          loaderVersion: selectedFabricLoader,
+        });
+      } else if (modLoaderType === "forge" && selectedForgeLoader) {
+        await invoke("install_forge", {
+          instanceId: instance.id,
+          gameVersion: selectedVersion!.id,
+          forgeVersion: selectedForgeLoader,
+        });
+      } else {
+        // Update instance with vanilla version_id
+        await invoke("update_instance", {
+          instance: { ...instance, version_id: selectedVersion!.id },
+        });
+      }
+
+      // Reload instances
+      await instancesState.loadInstances();
+
+      // Success! Close modal
+      resetModal();
+      onClose();
+    } catch (error) {
+      errorMessage = String(error);
+      creating = false;
+    }
+  }
+</script>
+
+{#if isOpen}
+  <div
+    class="fixed inset-0 z-[100] bg-black/80 backdrop-blur-sm flex items-center justify-center p-4"
+    role="dialog"
+    aria-modal="true"
+  >
+    <div
+      class="bg-zinc-900 border border-zinc-700 rounded-xl shadow-2xl w-full max-w-3xl max-h-[90vh] overflow-hidden flex flex-col"
+    >
+      <!-- Header -->
+      <div
+        class="flex items-center justify-between p-6 border-b border-zinc-700"
+      >
+        <div>
+          <h2 class="text-xl font-bold text-white">Create New Instance</h2>
+          <p class="text-sm text-zinc-400 mt-1">
+            Step {currentStep} of 3
+          </p>
+        </div>
+        <button
+          onclick={handleClose}
+          disabled={creating}
+          class="p-2 rounded-lg hover:bg-zinc-800 text-zinc-400 hover:text-white transition-colors disabled:opacity-50"
+        >
+          <X size={20} />
+        </button>
+      </div>
+
+      <!-- Progress indicator -->
+      <div class="flex gap-2 px-6 pt-4">
+        <div
+          class="flex-1 h-1 rounded-full transition-colors {currentStep >= 1
+            ? 'bg-indigo-500'
+            : 'bg-zinc-700'}"
+        ></div>
+        <div
+          class="flex-1 h-1 rounded-full transition-colors {currentStep >= 2
+            ? 'bg-indigo-500'
+            : 'bg-zinc-700'}"
+        ></div>
+        <div
+          class="flex-1 h-1 rounded-full transition-colors {currentStep >= 3
+            ? 'bg-indigo-500'
+            : 'bg-zinc-700'}"
+        ></div>
+      </div>
+
+      <!-- Content -->
+      <div class="flex-1 overflow-y-auto p-6">
+        {#if currentStep === 1}
+          <!-- Step 1: Name -->
+          <div class="space-y-4">
+            <div>
+              <label
+                for="instance-name"
+                class="block text-sm font-medium text-white/90 mb-2"
+                >Instance Name</label
+              >
+              <input
+                id="instance-name"
+                type="text"
+                bind:value={instanceName}
+                placeholder="My Minecraft Instance"
+                class="w-full px-4 py-2 bg-zinc-800 border border-zinc-700 rounded-lg text-white placeholder-zinc-500 focus:outline-none focus:ring-2 focus:ring-indigo-500"
+                disabled={creating}
+              />
+            </div>
+            <p class="text-xs text-zinc-400">
+              Give your instance a memorable name
+            </p>
+          </div>
+        {:else if currentStep === 2}
+          <!-- Step 2: Version Selection -->
+          <div class="space-y-4">
+            <div class="flex gap-4">
+              <div class="flex-1 relative">
+                <Search
+                  size={16}
+                  class="absolute left-3 top-1/2 -translate-y-1/2 text-zinc-500"
+                />
+                <input
+                  type="text"
+                  bind:value={versionSearch}
+                  placeholder="Search versions..."
+                  class="w-full pl-10 pr-4 py-2 bg-zinc-800 border border-zinc-700 rounded-lg text-white placeholder-zinc-500 focus:outline-none focus:ring-2 focus:ring-indigo-500"
+                />
+              </div>
+              <div class="flex gap-2">
+                {#each [
+                  { value: "all", label: "All" },
+                  { value: "release", label: "Release" },
+                  { value: "snapshot", label: "Snapshot" },
+                ] as filter}
+                  <button
+                    onclick={() => {
+                      versionFilter = filter.value as "all" | "release" | "snapshot";
+                    }}
+                    class="px-4 py-2 rounded-lg text-sm font-medium transition-colors {versionFilter ===
+                    filter.value
+                      ? 'bg-indigo-600 text-white'
+                      : 'bg-zinc-800 text-zinc-400 hover:text-white'}"
+                  >
+                    {filter.label}
+                  </button>
+                {/each}
+              </div>
+            </div>
+
+            <div class="max-h-96 overflow-y-auto space-y-2">
+              {#each filteredVersions() as version}
+                <button
+                  onclick={() => (selectedVersion = version)}
+                  class="w-full p-3 rounded-lg border transition-colors text-left {selectedVersion?.id ===
+                  version.id
+                    ? 'bg-indigo-600/20 border-indigo-500 text-white'
+                    : 'bg-zinc-800 border-zinc-700 text-zinc-300 hover:border-zinc-600'}"
+                >
+                  <div class="flex items-center justify-between">
+                    <span class="font-medium">{version.id}</span>
+                    <span
+                      class="text-xs px-2 py-1 rounded-full {version.type ===
+                      'release'
+                        ? 'bg-green-500/20 text-green-400'
+                        : 'bg-yellow-500/20 text-yellow-400'}"
+                    >
+                      {version.type}
+                    </span>
+                  </div>
+                </button>
+              {/each}
+
+              {#if filteredVersions().length === 0}
+                <div class="text-center py-8 text-zinc-500">
+                  No versions found
+                </div>
+              {/if}
+            </div>
+          </div>
+        {:else if currentStep === 3}
+          <!-- Step 3: Mod Loader -->
+          <div class="space-y-4">
+            <div>
+              <div class="text-sm font-medium text-white/90 mb-3">
+                Mod Loader Type
+              </div>
+              <div class="flex gap-3">
+                {#each [
+                  { value: "vanilla", label: "Vanilla" },
+                  { value: "fabric", label: "Fabric" },
+                  { value: "forge", label: "Forge" },
+                ] as loader}
+                  <button
+                    onclick={() => {
+                      modLoaderType = loader.value as "vanilla" | "fabric" | "forge";
+                    }}
+                    class="flex-1 px-4 py-3 rounded-lg text-sm font-medium transition-colors {modLoaderType ===
+                    loader.value
+                      ? 'bg-indigo-600 text-white'
+                      : 'bg-zinc-800 text-zinc-400 hover:text-white'}"
+                  >
+                    {loader.label}
+                  </button>
+                {/each}
+              </div>
+            </div>
+
+            {#if modLoaderType === "fabric"}
+              <div>
+                <label for="fabric-loader" class="block text-sm font-medium text-white/90 mb-2">
+                  Fabric Loader Version
+                </label>
+                {#if loadingLoaders}
+                  <div class="flex items-center gap-2 text-zinc-400">
+                    <Loader2 size={16} class="animate-spin" />
+                    Loading Fabric versions...
+                  </div>
+                {:else if fabricLoaders.length > 0}
+                  <select
+                    id="fabric-loader"
+                    bind:value={selectedFabricLoader}
+                    class="w-full px-4 py-2 bg-zinc-800 border border-zinc-700 rounded-lg text-white focus:outline-none focus:ring-2 focus:ring-indigo-500"
+                  >
+                    {#each fabricLoaders as loader}
+                      <option value={loader.loader.version}>
+                        {loader.loader.version} {loader.loader.stable ? "(Stable)" : "(Beta)"}
+                      </option>
+                    {/each}
+                  </select>
+                {:else}
+                  <p class="text-sm text-red-400">No Fabric loaders available for this version</p>
+                {/if}
+              </div>
+            {:else if modLoaderType === "forge"}
+              <div>
+                <label for="forge-version" class="block text-sm font-medium text-white/90 mb-2">
+                  Forge Version
+                </label>
+                {#if loadingLoaders}
+                  <div class="flex items-center gap-2 text-zinc-400">
+                    <Loader2 size={16} class="animate-spin" />
+                    Loading Forge versions...
+                  </div>
+                {:else if forgeVersions.length > 0}
+                  <select
+                    id="forge-version"
+                    bind:value={selectedForgeLoader}
+                    class="w-full px-4 py-2 bg-zinc-800 border border-zinc-700 rounded-lg text-white focus:outline-none focus:ring-2 focus:ring-indigo-500"
+                  >
+                    {#each forgeVersions as version}
+                      <option value={version.version}>
+                        {version.version}
+                      </option>
+                    {/each}
+                  </select>
+                {:else}
+                  <p class="text-sm text-red-400">No Forge versions available for this version</p>
+                {/if}
+              </div>
+            {:else if modLoaderType === "vanilla"}
+              <p class="text-sm text-zinc-400">
+                Create a vanilla Minecraft instance without any mod loaders
+              </p>
+            {/if}
+          </div>
+        {/if}
+
+        {#if errorMessage}
+          <div
+            class="mt-4 p-3 bg-red-500/10 border border-red-500/30 rounded-lg text-red-400 text-sm"
+          >
+            {errorMessage}
+          </div>
+        {/if}
+      </div>
+
+      <!-- Footer -->
+      <div
+        class="flex items-center justify-between gap-3 p-6 border-t border-zinc-700"
+      >
+        <button
+          onclick={() => goToStep(currentStep - 1)}
+          disabled={currentStep === 1 || creating}
+          class="px-4 py-2 rounded-lg bg-zinc-800 hover:bg-zinc-700 text-white transition-colors disabled:opacity-50 disabled:cursor-not-allowed flex items-center gap-2"
+        >
+          <ChevronLeft size={16} />
+          Back
+        </button>
+
+        <div class="flex gap-3">
+          <button
+            onclick={handleClose}
+            disabled={creating}
+            class="px-4 py-2 rounded-lg bg-zinc-800 hover:bg-zinc-700 text-white transition-colors disabled:opacity-50"
+          >
+            Cancel
+          </button>
+
+          {#if currentStep < 3}
+            <button
+              onclick={handleNext}
+              disabled={creating}
+              class="px-4 py-2 rounded-lg bg-indigo-600 hover:bg-indigo-500 text-white transition-colors disabled:opacity-50 flex items-center gap-2"
+            >
+              Next
+              <ChevronRight size={16} />
+            </button>
+          {:else}
+            <button
+              onclick={handleCreate}
+              disabled={creating ||
+                !instanceName.trim() ||
+                !selectedVersion ||
+                (modLoaderType === "fabric" && !selectedFabricLoader) ||
+                (modLoaderType === "forge" && !selectedForgeLoader)}
+              class="px-4 py-2 rounded-lg bg-indigo-600 hover:bg-indigo-500 text-white transition-colors disabled:opacity-50 flex items-center gap-2"
+            >
+              {#if creating}
+                <Loader2 size={16} class="animate-spin" />
+                Creating...
+              {:else}
+                Create Instance
+              {/if}
+            </button>
+          {/if}
+        </div>
+      </div>
+    </div>
+  </div>
+{/if}
diff --git a/ui/src/components/InstancesView.svelte b/ui/src/components/InstancesView.svelte
index a4881e6..e42f813 100644
--- a/ui/src/components/InstancesView.svelte
+++ b/ui/src/components/InstancesView.svelte
@@ -3,6 +3,7 @@
   import { instancesState } from "../stores/instances.svelte";
   import { Plus, Trash2, Edit2, Copy, Check, X } from "lucide-svelte";
   import type { Instance } from "../types";
+  import InstanceCreationModal from "./InstanceCreationModal.svelte";
 
   let showCreateModal = $state(false);
   let showEditModal = $state(false);
@@ -17,7 +18,6 @@
   });
 
   function handleCreate() {
-    newInstanceName = "";
     showCreateModal = true;
   }
 
@@ -38,13 +38,6 @@
     showDuplicateModal = true;
   }
 
-  async function confirmCreate() {
-    if (!newInstanceName.trim()) return;
-    await instancesState.createInstance(newInstanceName.trim());
-    showCreateModal = false;
-    newInstanceName = "";
-  }
-
   async function confirmEdit() {
     if (!selectedInstance || !newInstanceName.trim()) return;
     await instancesState.updateInstance({
@@ -195,39 +188,7 @@
 </div>
 
 <!-- Create Modal -->
-{#if showCreateModal}
-  <div class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
-    <div class="bg-white dark:bg-gray-800 rounded-lg p-6 w-96">
-      <h2 class="text-xl font-bold mb-4 text-gray-900 dark:text-white">Create Instance</h2>
-      <input
-        type="text"
-        bind:value={newInstanceName}
-        placeholder="Instance name"
-        class="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white mb-4"
-        onkeydown={(e) => e.key === "Enter" && confirmCreate()}
-        autofocus
-      />
-      <div class="flex gap-2 justify-end">
-        <button
-          onclick={() => {
-            showCreateModal = false;
-            newInstanceName = "";
-          }}
-          class="px-4 py-2 bg-gray-200 dark:bg-gray-700 text-gray-900 dark:text-white rounded-lg hover:bg-gray-300 dark:hover:bg-gray-600 transition-colors"
-        >
-          Cancel
-        </button>
-        <button
-          onclick={confirmCreate}
-          disabled={!newInstanceName.trim()}
-          class="px-4 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
-        >
-          Create
-        </button>
-      </div>
-    </div>
-  </div>
-{/if}
+<InstanceCreationModal isOpen={showCreateModal} onClose={() => (showCreateModal = false)} />
 
 <!-- Edit Modal -->
 {#if showEditModal && selectedInstance}