Fix stay-scout-hub progress text never updating

[Hotragn]

Refs #86. Found by the conformance check in #244.

The bug

The research-area SSE relay disagrees with itself about event names:

api/research-area/route.ts emits:   CONNECTED, SCREENSHOT, COMPLETE, ERROR
lib/api/area-search.ts reads:       STATUS, COMPLETE, ERROR
                                    + event.data.streamingUrl

STATUS is the only thing that sets currentAction, so area-search.ts:86 never ran and the progress line stayed empty for the entire run. The live preview and the final analysis both worked, which is why this wasn't obvious — only the running narration was missing.

CONNECTED is the mirror problem: the route sends it with a Starting research on ${area.name}... message and nothing reads it, so that first message never appeared either.

This came in with the SDK migration in #223. That PR correctly moved the route to EventType.STREAMING_URL / event.streaming_url, but the client-side handler kept the older vocabulary and nothing checked the two still lined up.

The fix

The route is the adapter between TinyFish's event vocabulary and this app's, so that's where the translation belongs.

It was consuming the agent stream but only forwarding STREAMING_URL and COMPLETE, dropping PROGRESS — which is the event that carries the running narration. Per the SDK's own types (@tiny-fish/sdk/dist/agent/types.d.ts:218-220), PROGRESS has a purpose: string. So:

if (event.type === EventType.PROGRESS) {
  enqueue({ type: "STATUS", message: event.purpose });
}

and the client now treats CONNECTED like STATUS, since both carry a message meant for the same line.

Two lines of behaviour, no new event names, no change to the live preview or the completion path.

Verification

cd stay-scout-hub && npm ci
npx tsc --noEmit    # clean

Heads up, unrelated to this PR: npm run lint fails for this recipe on main — it's eslint . with eslint@^9 but no eslint.config.js, so ESLint 9 can't find a config at all. I left it alone since it has nothing to do with this fix, but it means this recipe currently has no working lint. Happy to send a separate PR for that if useful.

[coderabbitai]

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