feat(connect): add Freighter missing-extension empty state with install CTA and re-check action (Closes #405)

[stayzappy]

Objective & Scope

Closes #405

This Pull Request implements a dedicated, accessible, and responsive empty state component (FreighterMissingCard) when the Freighter browser extension is missing or not installed, fulfilling all scope requirements and acceptance criteria for issue #405.

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Key Changes Made

1. Dedicated Empty State Component (src/components/FreighterMissingCard.tsx):

   • Renders a visually distinct glass card empty state whenever Freighter is missing (errorCode === 'FREIGHTER_UNAVAILABLE' or !isAvailable).
   • Distinct from ACCESS_DENIED (where user rejects access inside an installed extension).
   • Features prominent primary CTA button: Install Freighter Extension (https://www.freighter.app/ with target="_blank" rel="noopener noreferrer").
   • Features secondary action button: Re-check Connection (clears error state and re-verifies wallet connection).
   • Includes direct setup documentation link (https://docs.freighter.app/).

2. Integration into WalletConnect & Connect Page:

   • Integrated <FreighterMissingCard /> inside src/components/WalletConnect.tsx and src/pages/Connect.tsx.
   • Ensures no false-positives occur when Freighter is installed and unlocked.

3. Automated Test Coverage (src/components/FreighterMissingCard.test.tsx):

   • Primary flow: Renders empty state card with install CTA & docs link when FREIGHTER_UNAVAILABLE occurs.
   • User action: Clicking "Re-check Connection" clears error and triggers re-check/re-connect flow.
   • No false positive: Renders nothing when wallet is connected or when ACCESS_DENIED occurs.
   • Verified 100% test pass across FreighterMissingCard.test.tsx, WalletConnect.test.tsx, and Connect.test.tsx (49 / 49 tests passed).

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Acceptance Criteria Checklist

• Clear empty state when extension missing.
• Does not false-positive when Freighter present.

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