feat(inbox): Rename Conversations to Support and add product docs links

[posthog]

Summary

Follow-up to Annika's signal-sources onboarding feedback:

• Rename "Conversations" → "Support" in the signal source config UI (the PostHog product is surfaced as "Support" in the PostHog Cloud UI, so the PostHog Code name now matches).
• Add a "Learn about {product}" link to each PostHog product card so users unfamiliar with the underlying product can jump straight to its docs:
  • Error Tracking → https://posthog.com/docs/error-tracking
  • Support → https://posthog.com/docs/support
  • Session Replay → https://posthog.com/docs/session-replay
  • LLM Analytics → https://posthog.com/docs/llm-analytics

The internal conversations source key/enum is unchanged — only the user-facing label (and the toast label via SOURCE_LABELS) was renamed.

Test plan

• Open Settings → Signal sources: verify the "Support" card replaces "Conversations" and still toggles correctly
• Click "Learn about {product}" on each PostHog product card; confirm the docs page opens in the browser and the card's toggle does not flip
• Confirm the same cards render correctly in the onboarding Signals step
• Error toasts for the renamed source read "Failed to toggle PostHog Support"

---

Created with PostHog Code

[greptile-apps]

Prompt To Fix All With AI

This is a comment left during a code review.
Path: apps/code/src/renderer/features/inbox/components/SignalSourceToggles.tsx
Line: 216-241

Comment:
**Duplicated docs-link markup (OnceAndOnlyOnce)**

The docs-link JSX in `EvaluationsSection` is an exact copy of the one now rendered by `SignalSourceToggleCard` when `docsUrl` is provided. The URL string `"https://posthog.com/docs/llm-analytics"` is also repeated twice inside the same block (once in `href`, once in `window.open`).

Consider extracting a small shared component (e.g. `DocsLink`) and reusing it here, the same way the three PostHog cards use the new `docsUrl`/`docsLabel` props:

```tsx
function DocsLink({ url, label }: { url: string; label: string }) {
  return (
    <Text size="1" style={{ color: "var(--gray-11)" }}>
      <a
        href={url}
        target="_blank"
        rel="noopener noreferrer"
        onClick={(e) => {
          e.stopPropagation();
          e.preventDefault();
          window.open(url, "_blank", "noopener");
        }}
        style={{
          color: "var(--accent-11)",
          textDecoration: "none",
          display: "inline-flex",
          alignItems: "center",
          gap: "4px",
        }}
      >
        Learn about {label}
        <ArrowSquareOutIcon size={11} />
      </a>
    </Text>
  );
}
```

Then both `SignalSourceToggleCard` and `EvaluationsSection` can simply render `<DocsLink url="..." label="..." />`.

How can I resolve this? If you propose a fix, please make it concise.

_{Reviews (1): Last reviewed commit: "feat(inbox): Rename Conversations to Sup..." | Re-trigger Greptile}