bug: Create Bounty fails with 30s RPC timeout — tinyplace_bounties_create never completes

[Al629176]

Bug: Create Bounty fails with RPC timeout — tinyplace_bounties_create times out after 30s

Epic: #4190 — Tiny Place

Observed behaviour:
Submitting the Create Bounty form (with valid title, description, amount, asset: USDC, deadline) fails with:

CoreRpcError: Core RPC openhuman.tinyplace_bounties_create timed out after 30000ms

The bounty is not created. The error appears inline in the modal after the 30-second wait.

Expected behaviour:
Bounty creation should succeed within a few seconds and the new bounty should appear in the Bounties list.

Root cause areas to investigate:

• Is the tinyplace_bounties_create backend endpoint responding? Check if the backend is reachable at all from the core
• Is the bounty creation blocked on wallet/payment verification that is itself timing out (related to wallet balance bug)?
• Is USDC (EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v) accepted as the bounty reward asset?
• Check src/openhuman/tinyplace/manifest.rs → handle_tinyplace_bounties_create for the RPC handler and upstream SDK call
• Add a more granular timeout with retry logic and better error messaging (distinguish network timeout from payment failure)

Impact: P1 — bounty creation is completely non-functional.

Labels: bug, P1, tinyplace

[Al629176]

Part of epic #4190 — Tiny Place.