[Frontend] Replace console.log/warn/error with a real logger in client code

[ogazboiz]

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Why this matters

Several frontend modules ship console.* calls into production:

• frontend/src/app/activity/page.tsx:66 — console.error(\"Failed to fetch activity:\", error)
• frontend/src/app/streams/create/page.tsx:70 — console.error(\"Stream creation failed:\", error)
• frontend/src/app/streams/[id]/page.tsx:127 — console.error(\"Failed to fetch events:\", err)
• frontend/src/components/stream-creation/StreamCreationWizard.tsx:347 — console.warn(\"Polling error:\", e)
• frontend/src/components/stream-creation/StreamCreationWizard.tsx:370 — console.error(\"Failed to create stream:\", error)
• frontend/src/components/TransactionTracker.tsx:97,135 — console.error
• frontend/src/lib/dashboard.ts:172 — console.error(\"Dashboard data fetch error:\", error)
• frontend/src/lib/soroban.ts:185 — console.info(\[soroban:mock] ${label}`)`

There is no central logger. Errors are swallowed in production console; the :mock info even logs in real prod builds.

Acceptance criteria

• Add a small frontend/src/lib/logger.ts (or import a tiny module) that gates debug/info on process.env.NODE_ENV !== 'production' and always preserves errors
• Replace each console.* site above with the new helper
• Update lint config to forbid raw console.* outside the logger module

Files to touch

(all eight files listed above) plus a new frontend/src/lib/logger.ts

Out of scope

• Sending logs to an external service (Sentry, Datadog, etc.)

[adityabhatkar23]

i would like to work on this
@ogazboiz