fix: 避免 Claude 非会话页触发 no_turns_detected 误报

[NogaUwU]

背景

Claude 相关自动探测在 /login、/upgrade、/new 等非会话页面可能出现 no_turns_detected，导致误报可见 issue。

变更

• 将 isLikelyChatConversationPage() 改为平台感知：
  • ChatGPT: 仅 /c/
  • Claude: 仅 /chat/
• 仅在疑似真实会话页才上报 no_turns_detected。

影响

• 降低 Claude 非会话页面误报噪音
• 不影响真实会话页上的回归上报

Closes #31

[FuugaMo]

@codex Please review this PR. If you find no critical issues, reply with "LGTM". If you find critical issues, describe them clearly.

[github-actions]

review
node scripts/review-pr.js

Automated Review

Automated reviewer found issues that need human attention before merge.

Checklist

• selectors.json touched: no
• content.js touched: yes
• sidepanel/viewer touched: no

Findings

• Parser changed without updating selectors.json; verify this is intentional.

Verdict: needs-human-attention

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

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[github-actions]

review
node scripts/review-pr.js

Automated Review

LGTM from automated reviewer. Please still verify both ChatGPT and Claude manually before merge.

Checklist

• selectors.json touched: yes
• content.js touched: yes
• sidepanel/viewer touched: no

Findings

• No structural findings from the lightweight reviewer.

Verdict: lgtm