feat: prepare 2.2.0 with UI and execution fixes

Add dark theme, richer Markdown and readable plugin results.
Improve Android input evidence, response integrity and diagnostics.
Unify lifecycle, guidance receipts and evidence sources across clients.
Keep direct action dispatch without an added AI quota approval layer.
Align version metadata at 2.2.0 and bundle Helper 1.2.2.

Validation: 3063 backend tests before the version bump; 44 after.
Frontend: 317 tests and production build passed.

apps/showcase_ui/src/app/components/plugin-tool-result/plugin-tool-result.component.ts

@@ -0,0 +1,56 @@
+import { Component, computed, input } from '@angular/core';
+import { PluginToolView } from '../../utils/plugin-tool-view.util';
+
+/** Readable presentation only: the full receipt and model context stay intact. */
+@Component({
+  selector: 'app-plugin-tool-result',
+  standalone: true,
+  template: `
+    @if (view().facts.length) {
+      <dl class="receipt-facts">
+        @for (fact of view().facts; track fact.key) {
+          <div><dt>{{ fact.key }}</dt><dd>{{ fact.value }}</dd></div>
+        }
+      </dl>
+    }
+    @if (view().result) {
+      <pre class="receipt-preview">{{ preview() }}</pre>
+      @if (isLong()) {
+        <details class="receipt-detail receipt-text">
+          <summary>完整文本与控件树 <span>{{ view().result.length }} 字符</span></summary>
+          <pre>{{ view().result }}</pre>
+        </details>
+      }
+    }
+    @if (view().rawResult) {
+      <details class="receipt-detail receipt-raw">
+        <summary>原始返回 payload <span>完整保留</span></summary>
+        <pre>{{ view().rawResult }}</pre>
+      </details>
+    }
+  `,
+  styles: [`
+    :host { display: block; min-width: 0; width: 100%; user-select: text; cursor: auto; }
+    .receipt-facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(140px, 100%), 1fr)); gap: 8px 16px; margin: 0 0 12px; }
+    .receipt-facts div { min-width: 0; }
+    dt { font-size: 11px; color: var(--app-text-muted, #64748b); }
+    dd { margin: 3px 0 0; font-size: 12px; color: var(--app-text-control, #334155); overflow-wrap: anywhere; }
+    pre { margin: 0; padding: 10px 12px; border-radius: 6px; font: 12px/1.6 Consolas, monospace; color: var(--app-text-control, #334155); background: var(--app-surface-soft, #f8fafc); white-space: pre-wrap; overflow-wrap: anywhere; }
+    .receipt-preview { max-height: 180px; overflow: auto; }
+    .receipt-detail { margin-top: 10px; border: 1px solid var(--app-border, #e2e8f0); border-radius: 6px; min-width: 0; }
+    summary { padding: 9px 10px; font-size: 12px; color: var(--app-text-secondary, #475569); cursor: pointer; overflow-wrap: anywhere; }
+    summary span { margin-left: 8px; font-size: 11px; color: var(--app-text-muted, #64748b); }
+    summary:focus-visible { outline: 2px solid var(--app-primary-text, #1a73e8); outline-offset: 2px; }
+    .receipt-detail pre { max-height: 400px; overflow: auto; border-top: 1px solid var(--app-border, #e2e8f0); border-radius: 0 0 6px 6px; }
+  `]
+})
+export class PluginToolResultComponent {
+  view = input.required<PluginToolView>();
+  private readonly previewLimit = 1000;
+  preview = computed(() => {
+    const text = this.view().result;
+    const excerpt = text.split('\n').slice(0, 7).join('\n').slice(0, this.previewLimit);
+    return excerpt.length < text.length ? `${excerpt}\n…` : text;
+  });
+  isLong = computed(() => this.preview() !== this.view().result);
+}