fix: P2 audit items — use API client for stop, replace raw buttons, remove deprecated doc refs

- Replace raw fetch in handleStop with synthesesApi.stop()
- Add stop() method to synthesesApi
- Replace raw <button> elements in GenerateSynthesis with Button component (generate, retry, stop)
- Remove deprecated LLM link extraction schema reference from technical_specs.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/technical_specs.md

@@ -761,7 +761,7 @@ All calls use structured JSON output (response_schema defines the expected shape
 `llm/schema.rs` builds JSON Schema definitions for:
 - Classification/summarization: `{title, summary, category, is_article}`
 - Web search: `{category_0: [{title, url, summary}], ...}` with per-category arrays
-- Source link extraction schema is deprecated (link extraction mode is no longer configurable).
+- Source link extraction: handled via heuristic HTML parsing (no LLM schema).
 
 ### Error Mapping
 

frontend/src/api/syntheses.ts

@@ -85,6 +85,10 @@ export const synthesesApi = {
   sendEmail: (id: string, email: string): Promise<void> =>
     api.post<void>(`/syntheses/${id}/send-email`, { email } satisfies SendEmailRequest),
 
+  /** POST /syntheses/generate/:jobId/stop -- request cancellation of an in-progress generation job. */
+  stop: (jobId: string): Promise<void> =>
+    api.post<void>(`/syntheses/generate/${jobId}/stop`),
+
   /** Download the synthesis as a Markdown file via {@link fetchFile} + {@link triggerDownload}. */
   exportMarkdown: async (id: string): Promise<void> => {
     const response = await fetchFile(`/syntheses/${id}/export/markdown`);

frontend/src/pages/GenerateSynthesis.tsx

@@ -19,6 +19,7 @@ import type { UserSettings, ProviderConfig, ProgressEvent } from '~/types';
 import { createSSEConnection, type SSEConnection, type SSEStatus } from '~/utils/sse';
 import { providerSupportsWebSearch } from '~/utils/providers';
 import LoadingSpinner from '~/components/ui/LoadingSpinner';
+import Button from '~/components/ui/Button';
 
 /** Metadata for a single generation pipeline step. */
 interface StepInfo {
@@ -238,11 +239,7 @@ const GenerateSynthesis: Component = () => {
     const id = jobId();
     if (!id) return;
     try {
-      await fetch(`/api/v1/syntheses/generate/${id}/stop`, {
-        method: 'POST',
-        headers: { 'X-Requested-With': 'XMLHttpRequest' },
-        credentials: 'same-origin',
-      });
+      await synthesesApi.stop(id);
     } catch {
       // ignore errors — the pipeline will stop on its own
     }
@@ -422,13 +419,13 @@ const GenerateSynthesis: Component = () => {
                 </p>
 
                 {/* Stop generation button */}
-                <button
-                  type="button"
+                <Button
+                  variant="danger"
                   onClick={handleStop}
-                  class="mt-4 px-4 py-2 text-sm font-medium text-red-700 bg-red-50 border border-red-300 rounded-md hover:bg-red-100"
+                  class="mt-4"
                 >
                   {t('generate.stop')}
-                </button>
+                </Button>
               </div>
             </Show>
 
@@ -437,28 +434,20 @@ const GenerateSynthesis: Component = () => {
               <Show
                 when={!error()}
                 fallback={
-                  <button
-                    type="button"
-                    onClick={handleRetry}
-                    class="inline-flex items-center justify-center px-4 py-2 border border-transparent font-medium rounded-md text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 sm:text-sm w-full sm:w-auto"
-                  >
+                  <Button onClick={handleRetry}>
                     {t('generate.retry')}
-                  </button>
+                  </Button>
                 }
               >
-                <button
-                  type="button"
+                <Button
                   onClick={handleGenerate}
                   disabled={generating() || success() || !selectedThemeId()}
-                  class="inline-flex items-center justify-center px-4 py-2 border border-transparent font-medium rounded-md text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 sm:text-sm disabled:opacity-50 disabled:cursor-not-allowed w-full sm:w-auto"
+                  loading={generating() && !success()}
                 >
-                  <Show when={generating() && !success()}>
-                    <Loader2 class="animate-spin -ml-1 mr-2 h-5 w-5 text-white" />
-                  </Show>
                   {generating() && !success()
                     ? t('generate.inProgress')
                     : t('generate.launch')}
-                </button>
+                </Button>
               </Show>
             </div>
           </div>