feat(electrobun): project wizard phases 1-5 (WIP)

- sanitize.ts: input sanitization (trim, control chars, path traversal)
- provider-scanner.ts: detect Claude/Codex/Ollama/Gemini availability
- model-fetcher.ts: live model lists from 4 provider APIs
- ModelConfigPanel.svelte: per-provider config (thinking, effort, sandbox, temperature)
- WizardStep1-3.svelte: split wizard into composable steps
- CustomDropdown/Checkbox/Radio: themed UI components
- provider-handlers.ts: provider.scan + provider.models RPC
- Wire providers into wizard step 3 (live detection + model lists)
- Replace native selects in 5 settings panels with CustomDropdown

ui-electrobun/package.json

@@ -36,6 +36,7 @@
 		"@xterm/xterm": "^6.0.0",
 		"dompurify": "^3.3.3",
 		"electrobun": "latest",
+		"lucide-svelte": "^0.577.0",
 		"pdfjs-dist": "^5.5.207"
 	},
 	"devDependencies": {