Fix multiple UI issues (#767, #771, #773, #775, #777)

Summary

This MR fixes multiple UI issues and improves code quality:

• #777 (closed): Migrate from proxifyImageUrl to proxifyImageSrc with Base58 encoding
• #775 (closed): Fix long links overflowing containers
• #773 (closed): Show message when My Friends feed is empty
• #771 (closed): Fix images in comments overflowing container
• #767 (closed): Fix edit comment showing old content + add 30-day draft expiration

Additional improvements:

• Extract CommentsSection component to prevent re-renders when typing in reply box
• Add responsive width classes for post layout
• Replace useLocalStorage hook with native localStorage API to prevent unnecessary re-renders
• Add expiration (30 days) for comment drafts to cleanup old localStorage entries

Test plan

• Verify post page has responsive width on different screen sizes
• Verify typing in reply box doesn't cause content below to re-render
• Verify images are proxified correctly with new Base58 encoding
• Verify long links wrap properly in posts and comments
• Verify "My Friends" page shows message when not following anyone
• Verify images in comments don't overflow container
• Verify editing a comment shows current content, not original
• Verify Cancel button removes draft from localStorage
• Verify old comment drafts are cleaned up after 30 days

Closes #767 (closed), #771 (closed), #773 (closed), #775 (closed), #777 (closed)

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