fix(models): show real errors when client config import scan fails

importClientConfigs interpolated humanizeError() into a template string;
humanizeError returns an object, so users only saw "[object Object]".

Pass the structured result to toast() with importScanFailed as context.
Add node tests documenting the humanizeError coercion pitfall.

Co-authored-by: 晴天 <1186258278@users.noreply.github.com>

src/pages/models.js

@@ -1308,7 +1308,7 @@ async function importClientConfigs(page, state) {
     const result = await api.scanModelClientConfigs()
     candidates = Array.isArray(result?.candidates) ? result.candidates : []
   } catch (e) {
-    toast(`${t('models.importScanFailed')}: ${humanizeError(e)}`, 'error')
+    toast(humanizeError(e, t('models.importScanFailed')), 'error')
     return
   } finally {
     if (btn) { btn.disabled = false; btn.textContent = oldText || t('models.importClientConfigs') }

tests/humanize-error.test.js

@@ -0,0 +1,23 @@
+/**
+ * humanize-error.js contract: return value is a structured object for toast(),
+ * not for string interpolation (coerces to "[object Object]").
+ *
+ * 运行：node --test tests/humanize-error.test.js
+ */
+import test from 'node:test'
+import assert from 'node:assert/strict'
+
+import { humanizeError, humanizeErrorText } from '../src/lib/humanize-error.js'
+
+test('humanizeError must not be coerced with String() or template literals', () => {
+  const h = humanizeError(new Error('ECONNREFUSED 127.0.0.1:443'), 'Import scan failed')
+  assert.equal(typeof h, 'object')
+  assert.equal(String(h), '[object Object]')
+  assert.ok(h.message)
+})
+
+test('humanizeErrorText is safe for plain-string contexts', () => {
+  const line = humanizeErrorText(new Error('ENOENT no such file'), 'Import scan failed')
+  assert.match(line, /Import scan failed/)
+  assert.doesNotMatch(line, /\[object Object\]/)
+})