Fix agent places card map link and AI synthesis hallucinating no results

[Copilot]

Two bugs in the agent's places tool flow: the AI synthesis would claim no results despite the places card showing them, and the "Open map" link pointed to the generic /places page requiring a new paid API call.

Root causes & fixes

AI says "couldn't find results" when results exist

The synthesizer RAG context was receiving raw JSON ({"results":[...],"count":5}), which the LLM failed to interpret reliably. New formatPlacesResult() pre-converts the JSON to readable text before passing to the synthesizer:

Found 3 place(s) matching "cafe" near Hampton, UK:
1. Hampton Cafe (cafe) — 12 High St, Hampton
2. The Tea Room (cafe) — 5 River Rd, Hampton

Map link goes to generic /places (triggers another paid search)

renderPlacesCard previously linked to /places unconditionally. Now placesMapURL() builds a deterministic Google Maps URL directly from the original tool args — no server round-trip, no additional cost:

• q + near/address → https://www.google.com/maps/search/?api=1&query=cafe+Hampton+UK
• q only → query-only search URL
• Fallback → coordinate-based URL from first result's lat/lon
• Last resort → /places

Structural changes

• toolResult struct gains Args map[string]any so tool call arguments flow through to card renderers
• placeItem gains Lat/Lon fields for the coordinate fallback
• renderResultCard / renderPlacesCard updated to accept and use args

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