fix(electrobun): wizard 7 fixes — validation, GitLab, SSHFS, icons, model dropdown, keyboard nav

- Git Platform: validates repo via git.probe before enabling Next, supports GitHub + GitLab + any git URL
- Template dir configurable in Advanced Settings (template_dir key)
- SSHFS: checks sshfs availability, mountpoint selector when enabled
- CustomDropdown: flip-up when insufficient space below
- 50 Lucide icons (was 24) with categories (AI, Data, DevOps, Security, Media, Comms)
- Model: CustomDropdown from live API, max_tokens as slider, effort only with adaptive thinking
- Keyboard: Escape closes wizard, Tab navigation with :focus-visible rings, source cards navigable

ui-electrobun/src/bun/handlers/git-handlers.ts

@@ -8,6 +8,15 @@ import { execSync, spawn } from "child_process";
 
 export function createGitHandlers() {
   return {
+    "ssh.checkSshfs": async () => {
+      try {
+        const sshfsPath = execSync("which sshfs", { encoding: "utf8", timeout: 3000 }).trim();
+        return { installed: true, path: sshfsPath };
+      } catch {
+        return { installed: false, path: null };
+      }
+    },
+
     "git.branches": async ({ path: repoPath }: { path: string }) => {
       try {
         const resolved = path.resolve(repoPath.replace(/^~/, process.env.HOME ?? ""));