Feat/issues 345 346 347 348

[meloball9993-star]

Summary

Addresses four UX issues across wallet connection, onboarding, search, and invoice cards.

Changes

#348 — Wallet connection error recovery UI

• New WalletErrorModal component handles 4 distinct error states: not installed, locked, network mismatch, and rejected
• Each state has its own icon, heading, description, and CTA
• "Rejected" surfaces as a dismissible toast with no modal interruption
• Modal dismissible via Escape, backdrop click, or explicit button
• WalletConnect updated to classify errors and route to the correct UI

#345 — First-time onboarding flow

• Rewrote OnboardingFlow to match the 3-step spec: Connect wallet → Create invoice → Share and get paid
• Keyed off split-onboarded in localStorage; never shown again after completion
• Progress bar, "Skip for now" on every step, step state persisted across page reloads
• Step 1 embeds WalletConnect inline; Step 2 links to /invoice/new?prefill=example

#347 — Global search

• New GlobalSearch component added to the navbar
• Searches invoice ID, title, creator address, and recipient addresses
• Results debounced at 300 ms, grouped into Invoices / Addresses sections
• Fully keyboard-navigable (↑↓ to move, Enter to open, Escape to close)
• Cmd/Ctrl+K shortcut to open from anywhere
• "No results" empty state with "Create new invoice" CTA
• Toggle between connected wallet's invoices and all public invoices

Closes

Closes #345
Closes #347
Closes #348
Closes #346

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