fix(web): visual QA front-end items U4–U6, U13–U16 and copy list

- U4: form save failures toast the first problem and scroll/focus the first
  invalid field (policy draft, settings cards, resource drawers, subscription
  form) via lib/form-errors.
- U5: FormField keeps 8px between a hint and the next label.
- U6: file manager status bar keeps free space left-aligned, clear of the
  Agent button.
- U13: move/copy dialog stops "target is the source folder / inside the
  source" before requesting a preview (transferTargetProblem + tests).
- U14: account popover uses the solid float material.
- U15/U16: inbox tile hint shortened; TMDB assign dialog uses the shared
  Select and labelled fields (type, TMDB ID, note).
- Copy: "TMDB 已保存" spacing, API Key block no longer repeats the section
  title, whole-day intervals read "每 7 天", "最高级别:提示",
  "延后:已有计划在途", failed records show "未生成目标路径", upstream model
  column "默认模型".

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/settings/settings-card.tsx

@@ -12,6 +12,7 @@ import { ErrorState, LoadingState } from "~/components/console/empty-state.tsx";
 import { zodFieldErrors } from "~/components/console/form-field.tsx";
 import { Button } from "~/components/ui/button.tsx";
 import { errorMessage } from "~/lib/api.ts";
+import { revealFirstError } from "~/lib/form-errors.ts";
 import { FieldControl, type FieldSpec, type FormValues } from "./resource-section.tsx";
 import { SettingsBlock } from "./settings-block.tsx";
 
@@ -56,13 +57,14 @@ export function SettingsCard({
           fe[spec.fields.find((f) => k.startsWith(f.name.split(".")[0] ?? ""))?.name ?? k] ??= m;
       }
       setErrors(fe);
+      revealFirstError();
       return;
     }
     setErrors({});
     try {
       const next = await update.mutateAsync(patch);
       setValues(spec.fromSettings(next));
-      toast.success(`${spec.title}已保存`);
+      toast.success(`${spec.title} 已保存`);
     } catch (err) {
       toast.error(errorMessage(err, "保存失败"));
     }