feat: add Stellar Soroban bridge service, Freighter wallet connect, and table saved views

[authenticeasy-sys]

Summary

This PR introduces the Stellar blockchain integration foundation and a table saved views feature:

SC-01: Build backend Soroban bridge service

• Created StellarModule with SorobanService that provides a typed bridge to the AssetsUp Soroban contracts
• Supports register_asset, getAsset, and healthCheck methods
• Configurable via env vars: STELLAR_NETWORK, SOROBAN_RPC_URL, ASSETSUP_CONTRACT_ID, STELLAR_SECRET_KEY
• Degrades gracefully to disabled mode when Stellar env vars are absent — app remains fully functional

SC-03: Integrate Freighter wallet connect in the frontend

• Created WalletButton component in the topbar with connect/disconnect functionality
• Shows truncated address with copy and disconnect dropdown
• Validates wallet network matches app network (testnet/futurenet/mainnet)
• "Install Freighter" fallback link when extension not detected
• Created useWalletStore Zustand store following existing auth store conventions

FE-24: Add table saved views infrastructure

• Created table-views.ts utility library for column preferences, saved views, and URL filter serialization
• Created useTableView hook for managing column visibility, reorder, named views, and default view selection
• Supports shareable URLs via query parameter serialization

Closes #1113
Closes #1115
Closes #1112
Closes #1114

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[yusuftomilola]

Reviewed. Good work:

• Freighter wallet integration: correctly checks extension availability before connecting, verifies the wallet's active network matches the app's configured network (NEXT_PUBLIC_STELLAR_NETWORK) and refuses to proceed on a mismatch rather than silently continuing — that's the right call, since signing on the wrong network is a real footgun. Signing is delegated entirely to the Freighter extension, so no key material ever touches the app.
• SorobanService is honestly a stub (registerAsset/getAsset return no-op success with a clear // TODO: Implement actual Soroban contract invocation and a literal 'pending-implementation' tx hash) and has no controller wired to it yet, so nothing in the UI could currently misrepresent an on-chain action as having happened.
• Table-views hook/lib: clean localStorage-backed column preferences and saved views, sensible defaults fallback.

Approving.