fix(swa): gate relay info modal on connected status with loaded info

[Ryback2501]

Summary

• Add NIP-11 to the supported-specs list shown in the about modal.
• Make the relay-info modal openable only from a connected relay whose information document has been fetched; disconnected/unfetched relays are no longer clickable.
• Clicking the Connect button never reopens a stale relay-info modal — currentRelayModalUrl is now cleared whenever the modal is closed.

Changes

SWA (swa/)

• app.js — Added '11' to SUPPORTED_SPECS. In rerenderRelayList, the URL element now only gets a click handler and the clickable class when status === 'connected' and store.relayInfos.has(url). Introduced closeRelayModal() which hides the modal and resets currentRelayModalUrl = null, used by the close button, the overlay click-through, and the Escape key handler.
• style.css — .relay-item-url no longer has cursor: pointer or a hover color by default. Both are now gated behind the .clickable modifier class.

Test plan

• On a fresh load, only relays that are connected AND have returned a NIP-11 document show pointer cursor and are clickable.
• Clicking on a disconnected relay does nothing — no empty modal is shown.
• Clicking the Connect button on any relay never opens the relay-info modal, even after previously closing it on the same relay.
• Opening the relay-info modal on a connected relay, closing it (X button, overlay click, or Escape), and then disconnecting/reconnecting does not reopen the modal automatically.
• The about modal shows the NIP-11 badge alongside the other supported specs.