feat(deepseek): normalize model labels and unwrap redirect URLs

- Normalize provider_model so UI shows DeepSeek/DeepSeek-R1 instead of raw toggle text (联网搜索 etc.)
- Unwrap DeepSeek redirect URLs (chat.deepseek.com/api/redirect?url=...) to canonical sources
- Expand reasoning sections and separate reasoning search pages from answer-body citations
- Improve webpages-trigger click heuristics and auxiliary link filtering in answer rendering

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/main/adapters/deepseek.test.ts

@@ -97,6 +97,40 @@ describe("deepseek adapter helpers", () => {
     expect(classified.searchResults).toHaveLength(1);
   });
 
+  it("keeps reasoning search pages as citation sources separate from answer content citations", () => {
+    const classified = classifyDeepseekSources({
+      inlineLinks: [
+        {
+          url: "https://example.com/body-citation",
+          title: "Answer body citation",
+          text: "[15]",
+          siteName: "Body Site",
+          kind: "inline",
+        },
+      ],
+      sourcePanelLinks: [],
+      searchPanelLinks: [
+        {
+          url: "https://example.com/reasoning-search",
+          title: "Reasoning searched page",
+          text: "浏览页面",
+          siteName: "Search Site",
+          kind: "search",
+        },
+      ],
+    });
+
+    expect(classified.inlineCitationCandidates.map((item) => item.url)).toEqual([
+      "https://example.com/body-citation",
+    ]);
+    expect(classified.citations.map((item) => item.url)).toEqual([
+      "https://example.com/reasoning-search",
+    ]);
+    expect(classified.searchResults.map((item) => item.url)).toEqual([
+      "https://example.com/reasoning-search",
+    ]);
+  });
+
   it("retains all revealed DeepSeek search results instead of truncating after 32 items", () => {
     const searchPanelLinks = Array.from({ length: 78 }, (_, index) => ({
       url: `https://example.com/search-${index + 1}`,
@@ -173,6 +207,22 @@ describe("deepseek adapter helpers", () => {
     }));
   });
 
+  it("unwraps DeepSeek redirect URLs before storing source items", () => {
+    const item = buildSourceItem({
+      url: "https://chat.deepseek.com/api/redirect?url=https%3A%2F%2Fexample.com%2Fsource%23ref",
+      title: "Redirected source",
+      text: null,
+      siteName: null,
+      kind: "search",
+    });
+
+    expect(item).toEqual(expect.objectContaining({
+      url: "https://example.com/source",
+      normalized_url: "https://example.com/source",
+      host: "example.com",
+    }));
+  });
+
   it("does not use numeric citation markers as source titles", () => {
     const item = buildSourceItem({
       url: "https://example.com/report#cite-1",
@@ -217,6 +267,45 @@ describe("deepseek adapter helpers", () => {
     expect(isDeepSeekWebpagesTriggerText("搜索到 39 个网页")).toBe(false);
   });
 
+  it("normalizes DeepSeek model labels without mistaking search toggles for models", () => {
+    const snapshot = {
+      url: "https://chat.deepseek.com/",
+      title: "DeepSeek",
+      loginRequired: false,
+      loginReason: null,
+      challengeRequired: false,
+      challengeReason: null,
+      busy: false,
+      busySignals: [],
+      composerValue: null,
+      sendDisabled: false,
+      answer: "Final answer",
+      answerText: "Final answer",
+      reasoning: null,
+      signature: "sig-1",
+      currentModelLabel: "深度思考 (R1)",
+      providerRequestID: null,
+      requestID: null,
+      inlineLinks: [],
+      sourcePanelLinks: [],
+      searchPanelLinks: [],
+    };
+    const sources = {
+      citations: [],
+      inlineCitationCandidates: [],
+      searchResults: [],
+    };
+
+    const r1Payload = buildDeepSeekPayload(snapshot, sources, "Final answer");
+    const searchPayload = buildDeepSeekPayload({
+      ...snapshot,
+      currentModelLabel: "联网搜索",
+    }, sources, "Final answer");
+
+    expect(r1Payload.provider_model).toBe("DeepSeek-R1");
+    expect(searchPayload.provider_model).toBeNull();
+  });
+
   it("builds json-safe payloads with null placeholders instead of undefined", () => {
     const payload = buildDeepSeekPayload({
       url: "https://chat.deepseek.com/",