feat(electrobun): complete project wizard phases 4-5

- ModelConfigPanel: Claude thinking/effort, Codex sandbox/approval, Ollama
  temp/ctx/predict, Gemini thinkingLevel/budget (mutually exclusive)
- CustomDropdown: themed with keyboard nav, groupBy, display:none pattern
- CustomCheckbox/CustomRadio: themed with Lucide icons
- Replaced native selects in 5 settings panels + wizard steps
- wizard-state.ts: shared type definitions
- Gemini added as 4th provider throughout

ui-electrobun/src/mainview/wizard-state.ts

@@ -0,0 +1,68 @@
+/**
+ * Wizard state management — field update dispatch and default values.
+ *
+ * Extracted from ProjectWizard.svelte to keep it under 300 lines.
+ */
+
+export type SourceType = 'local' | 'git-clone' | 'github' | 'template' | 'remote';
+export type AuthMethod = 'password' | 'key' | 'agent' | 'config';
+export type PathState = 'idle' | 'checking' | 'valid' | 'invalid' | 'not-dir';
+export type ProbeState = 'idle' | 'probing' | 'ok' | 'error';
+
+export interface WizardState {
+  step: number;
+  sourceType: SourceType;
+  localPath: string;
+  repoUrl: string;
+  cloneTarget: string;
+  githubRepo: string;
+  selectedTemplate: string;
+  templateTargetDir: string;
+  remoteHost: string;
+  remoteUser: string;
+  remotePath: string;
+  remoteAuthMethod: AuthMethod;
+  remotePassword: string;
+  remoteKeyPath: string;
+  remoteSshfs: boolean;
+  pathValid: PathState;
+  isGitRepo: boolean;
+  gitBranch: string;
+  gitProbeStatus: ProbeState;
+  gitProbeBranches: string[];
+  githubInfo: { stars: number; description: string; defaultBranch: string } | null;
+  githubLoading: boolean;
+  cloning: boolean;
+  projectName: string;
+  nameError: string;
+  selectedBranch: string;
+  branches: string[];
+  useWorktrees: boolean;
+  selectedGroupId: string;
+  projectIcon: string;
+  projectColor: string;
+  shellChoice: string;
+  provider: string;
+  model: string;
+  permissionMode: string;
+  systemPrompt: string;
+  autoStart: boolean;
+  providerModels: Array<{ id: string; name: string; provider: string }>;
+  modelsLoading: boolean;
+}
+
+export function getDefaults(groupId: string): WizardState {
+  return {
+    step: 1, sourceType: 'local', localPath: '', repoUrl: '', cloneTarget: '',
+    githubRepo: '', selectedTemplate: '', templateTargetDir: '~/projects',
+    remoteHost: '', remoteUser: '', remotePath: '',
+    remoteAuthMethod: 'agent', remotePassword: '', remoteKeyPath: '~/.ssh/id_ed25519',
+    remoteSshfs: false, pathValid: 'idle', isGitRepo: false, gitBranch: '',
+    gitProbeStatus: 'idle', gitProbeBranches: [], githubInfo: null, githubLoading: false,
+    cloning: false, projectName: '', nameError: '', selectedBranch: '',
+    branches: [], useWorktrees: false, selectedGroupId: groupId,
+    projectIcon: 'Terminal', projectColor: 'var(--ctp-blue)', shellChoice: 'bash',
+    provider: 'claude', model: '', permissionMode: 'default',
+    systemPrompt: '', autoStart: false, providerModels: [], modelsLoading: false,
+  };
+}