[Feature] Add LOBSTR wallet support via the WalletAdapter interface

[collinsezedike]

Summary

Implement WalletAdapter (apps/web/src/lib/wallet.ts) for LOBSTR, alongside FreighterWallet and (once #488 lands) XBullWallet. LOBSTR is mobile-first, unlike Freighter.

Motivation

Same motivation as #488: the README targets emerging-market users and the roadmap names low-end Android devices as the target device class, but Freighter cannot be installed on mobile. LOBSTR is one of the most widely used mobile Stellar wallets and is a real path to reaching that user.

Proposed Solution

Add a LobstrWallet class implementing the WalletAdapter interface (isInstalled/isAuthorized/connect/sign) introduced in #476, using LOBSTR's own connection API (likely WalletConnect-based, since LOBSTR doesn't expose a browser-extension API the way Freighter does — confirm the actual integration path during implementation). Do not wire it into the UI yet, same as #488; the wallet-picker issue comes after at least one non-Freighter wallet exists to design against.

Scope

Field	Value
Area	Frontend
Protocol affected	None
Network	Both
Breaking change?	No

Acceptance Criteria

• LobstrWallet implements WalletAdapter fully (isInstalled, isAuthorized, connect, sign)
• Matches the same E2E-mock-wallet short-circuit pattern FreighterWallet uses, so Playwright e2e tests can exercise it without a real wallet
• Unit tests covering the real LOBSTR path and the e2e-mock path, mirroring wallet.test.ts's existing Freighter coverage
• pnpm --filter @meridian/web lint && pnpm --filter @meridian/web typecheck && pnpm --filter @meridian/web test pass

Additional Context

Third of the multi-wallet batch. Depends on #476 (merged). Followed by a wallet-picker UI issue, then a docs update.

[Chigybillionz]

Hi, I’ve reviewed this issue and I’m confident I can fix it. I’d like to take it on.

[DammyAji]

Hi @collinsezedike, I'd like to work on this issue please. I'm a frontend developer who's worked on open source contributions across projects using Typescript. I've reviewed this description and I'll be able to Add LOBSTR wallet support via the WalletAdapter interface. I'd also follow the guidelines to implement changes from proposed solution, scope, and acceptance criteria. I'd really appreciate it if you assign this to me. Thanks in advance.

[collinsezedike]

@DammyAji I reckon you're a good fit for this issue.

[grantfox-oss]

🦊 GrantFox — @DammyAji has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #490)
2. Your PR will be reviewed by the drydocs maintainers

Good luck! Track your progress on GrantFox.