Add shareable verification receipt links

[kojibai]

Motivation

• Allow a verification link shared after a successful verify to reproduce the verified state for recipients so they can open the link and immediately see that the sigil was verified.
• Avoid requiring recipients to upload the original SVG by encoding a compact receipt into the shared URL that the verifier can hydrate into its UI.

Description

• Added a SharedReceipt type and helpers parseProofCapsule, readSharedReceiptFromLocation, encodeReceiptParam, and buildReceiptShareUrl to encode/decode a canonical receipt payload into a base64url r query parameter.
• Wire VerifyPage to read an initial receipt (initialReceipt) and maintain sharedReceipt state, hydrate result/embeddedProof/proof hashes from the receipt when no SVG is present, and prefer the receipt-containing share URL when sharing (onShareReceipt).
• Clear sharedReceipt whenever the user uploads, edits, or verifies a new SVG to avoid stale state, and import derivePhiKeyFromSig/base64UrlEncode to validate and construct hydrated state.
• Changes confined to src/pages/VerifyPage.tsx and related helper usage; receipt encoding uses base64UrlEncode and canonical receiptJson produced by existing receiptJson logic.

Testing

• No automated tests were run for this change.

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Codex Task

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Project	Deployment	Review	Updated (UTC)
phi-network-5aii	Ready	Preview, Comment	Jan 11, 2026 5:23pm

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