fix: resolve Stellar Wave bugs (#451-454)

[devwura]

Summary

This PR fixes 4 interconnected bugs in the Stellar Wave feature:

• ConfirmDialog does not prevent close while loading async action #454: ConfirmDialog does not prevent close while loading async action
• useSessions AbortController cleanup is unreachable #453: useSessions AbortController cleanup is unreachable
• Connect page silently swallows profile fetch errors after wallet connection #452: Connect page silently swallows profile fetch errors after wallet connection
• Settings page language preference is never persisted #451: Settings page language preference is never persisted

Changes

1. ConfirmDialog - Prevent close while loading (#454)

• Added handleOpenChange handler to prevent dialog closure when loading is true
• Preserves visual feedback until async operations complete
• Prevents accidental dismissal of destructive action confirmations

2. useSessions - Fix AbortController cleanup (#453)

• Moved AbortController creation from useCallback into useEffect
• Properly return cleanup function from useEffect to cancel in-flight requests
• Prevents stale state updates after component unmount

3. Connect Page - Handle profile fetch errors (#452)

• Moved success toast to after successful profile fetch
• Added explicit error handling and display for profile fetch failures
• Prevents showing success message when the full connection flow fails

4. Settings Page - Persist language preference (#451)

• Load language preference from profile on component mount
• Include language in the updateProfile API call
• User's language preference now persists across sessions

Testing

Each fix addresses a specific issue:

• Test ConfirmDialog by triggering an async action and attempting to close the dialog
• Test useSessions by checking that requests are cancelled on component unmount
• Test Connect page by simulating a profile fetch error after wallet connection
• Test Settings page by changing language preference and verifying it persists

closes #451
closes #452
closes #453
closes #454

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