fix(desktop-client): stop false manual-verification states and auto-revive probes after sleep/offline

Challenge detection previously regex-matched the entire page innerText, so
chat transcripts or console copy containing words like 验证码/安全验证/verify
flagged healthy accounts as challenge_required. Detection is now scoped to
real evidence only (visible captcha vendor widgets, short modal copy, sparse
interstitial pages) via a shared challenge-signals module used by the generic
AI probe, doubao/kimi/qwen auth rules, and the deepseek runtime snapshot.
Platform API error codes (e.g. baijiahao_challenge_required) keep working.

Account health also could not recover after lid-close sleep or a network
drop: offline probes misread cached console pages as expired, and expired
records null out nextProbeAt so they were never re-probed. Probing is now
skipped while offline (network_error backoff instead), and powerMonitor
resume/unlock plus an offline-to-online transition watch schedule jittered
recovery probes for all tracked accounts, including expired ones. Challenge
rechecks wait 8s so transient widgets during page load no longer stick.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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

@@ -2379,20 +2379,72 @@ async function readDeepSeekPageSnapshot(
     }
 
     const bodyText = normalize(document.body?.innerText || '')
+    // 登录/验证判定不能直接对整页 innerText 匹配：聊天问题与回答里出现
+    // "登录/验证码/安全验证" 这类词会把正常会话误判成需要人工处理。
+    // 只认三类证据：sign_in 路由、可见弹层内的短文案、稀疏拦截页。
+    const loginPhrasePattern =
+      /(log in|send code|scan with wechat to login|phone number|continue with deepseek|和 deepseek 继续聊|登录|发送验证码|手机号|验证码)/i
+    const challengePhrasePattern =
+      /(人机验证|安全验证|请完成验证|完成下方验证|拖动滑块|滑动验证|向右滑动|安全检测|访问异常|环境异常|verification required|security check|unusual traffic|not a robot|请输入(?:图形)?验证码)/i
+    const findVisibleSurfaceText = (
+      selectors: string,
+      pattern: RegExp,
+      maxTextLength: number,
+    ): boolean => {
+      for (const node of Array.from(document.querySelectorAll(selectors)).slice(0, 50)) {
+        if (!isVisible(node)) {
+          continue
+        }
+        const text = normalize(node.innerText || node.textContent)
+        if (text && text.length <= maxTextLength && pattern.test(text)) {
+          return true
+        }
+      }
+      return false
+    }
+    const hasChallengeVendorWidget = (() => {
+      const vendorSelectors = [
+        '[class*="geetest_"]',
+        '[id^="nc_"][id$="_wrapper"]',
+        '.nc-container',
+        '[class*="nocaptcha"]',
+        '[class*="yidun_modal"]',
+        '[class*="yidun_popup"]',
+        '[class*="vaptcha"]',
+        '[class*="tcaptcha"]',
+        '#tcaptcha_iframe',
+        '[class*="captcha_verify"]',
+        '[class*="secsdk-captcha"]',
+        'iframe[src*="captcha"]',
+        'iframe[src*="geetest"]',
+        'iframe[src*="turnstile"]',
+        'iframe[src*="hcaptcha"]',
+        'iframe[src*="recaptcha"]',
+        'iframe[title*="验证"]',
+      ].join(',')
+      for (const node of Array.from(document.querySelectorAll(vendorSelectors)).slice(0, 50)) {
+        if (isVisible(node)) {
+          return true
+        }
+      }
+      return false
+    })()
     const loginRequired =
       window.location.pathname.includes('/sign_in') ||
-      Boolean(
-        bodyText &&
-        /(log in|send code|scan with wechat to login|phone number|continue with deepseek|和 deepseek 继续聊|登录|发送验证码|手机号|验证码)/i.test(
-          bodyText,
-        ),
-      )
-    const challengeRequired = Boolean(
-      bodyText &&
-      /(verification required|captcha|security check|verify|challenge|人机验证|安全验证|请完成验证|验证码|风控|环境异常)/i.test(
-        bodyText,
-      ),
-    )
+      findVisibleSurfaceText(
+        '[role="dialog"], [aria-modal="true"], [class*="modal"], [class*="login"], [class*="sign"], [class*="auth"]',
+        loginPhrasePattern,
+        300,
+      ) ||
+      Boolean(bodyText && bodyText.length <= 600 && loginPhrasePattern.test(bodyText))
+    const challengeRequired =
+      hasChallengeVendorWidget ||
+      findVisibleSurfaceText(
+        '[role="dialog"], [aria-modal="true"], [class*="captcha"], [id*="captcha"], [class*="verify"], [class*="Verify"]',
+        challengePhrasePattern,
+        240,
+      ) ||
+      Boolean(bodyText && bodyText.length <= 400 && challengePhrasePattern.test(bodyText))
 
     const busyDescriptors: string[] = []
     for (const node of Array.from(