Support Ponder subgraph schemas in umbra-js and frontend

[garyghayrat]

Summary

• add Ponder-compatible subgraph queries for announcement and stealth key scans
• auto-detect Ponder vs legacy subgraph schemas and fall back when Ponder fields are unavailable
• wire the frontend to the new subgraph configuration and add schema compatibility coverage

Testing

• add umbra-js/test/subgraph-schema.test.ts

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[github-actions]

Coverage after merging feat-ponder-sh into master will be

85.93%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
contracts-periphery/src
UmbraBatchSend.sol	100%	100%	100%	100%
UniswapWithdrawHook.sol	100%	100%	100%	100%
umbra-js/src
ethers.ts	86.27%	100%	75%	100%
types.ts	50%	100%	0%	100%
umbra-js/src/classes
KeyPair.ts	98.54%	97.62%	100%	98.75%	248, 250
RandomNumber.ts	100%	100%	100%	100%
StealthKeyRegistry.ts	100%	100%	100%	100%
TxHistoryProvider.ts	85.19%	65%	100%	96.55%	12, 17, 20, 23, 29, 43, 48, 8
Umbra.ts	82.61%	72.32%	90.70%	87.76%	162–163, 184, 257–258, 326, 344–347, 383–384, 415, 430, 433, 440–442, 444, 451, 454, 459, 459, 461, 461, 461, 461, 461–462, 464–465, 48, 495, 495, 495, 497, 497, 497, 499, 499, 499, 499–500, 500, 500–502, 518–519, 584–586, 627, 682, 686, 732, 745–746, 756–757, 771, 779–780, 810–811, 886–887, 890, 893–894, 900–902, 909, 909, 909–912, 947, 949–950, 950–951
umbra-js/src/utils
cns.ts	50%	33.33%	50%	55%	33–36, 40, 40, 40, 40, 40–41, 44–46
constants.ts	100%	100%	100%	100%
ens.ts	36.11%	25%	33.33%	40%	25–27, 35, 56–57, 57, 57–58, 63–64, 66, 70, 70, 70, 70, 70–71, 75–77
sharedSecret.ts	83.05%	72.73%	100%	87.88%	24, 27–28, 42–43, 47–48, 62, 62–63
utils.ts	76.59%	69.92%	81.08%	81.02%	111–112, 1234–1235, 1247–1248, 137, 145, 145, 161–163, 165–167, 173, 195–196, 222–224, 224, 224–225, 225, 225, 246, 311, 314, 319, 323, 327, 337, 349–354, 356–363, 363, 363, 363, 363, 363, 363–364, 366, 376, 407–409, 415, 425–426, 433–434, 441, 451, 451–452, 452–453, 458, 488–489, 498–499, 519–521, 534–535, 561–563, 572, 645, 652, 652–653, 653, 653–654, 654, 656, 660, 723, 725–726, 735, 735, 735–736, 738, 741, 750–751, 792, 809, 809, 809, 838, 860–862, 865, 875, 887, 887–888, 893, 895–896, 907–911, 924, 926, 977–978, 978, 978–980, 980, 980, 991
umbra-js/test
testPrivateKeys.ts	100%	100%	100%	100%
utils.ts	100%	100%	100%	100%