[uveshm003]

Fixes #12

Problem

In the "What's new" changelog dialog, the Close and Join Reddit Community buttons sat in a plain Row. A typical phone dialog leaves about 240 logical px for that row (360dp screen minus the dialog's 40px insets and 20px padding on each side), which isn't enough room. The row overflowed, and the Close button ended up cramped or clipped, as in the screenshot in the issue. One commenter never noticed there was a Close option at all.

Fix

Replaced the Row with an OverflowBar, right-aligned with 8px spacing:

• When there is room, the buttons sit side by side at the end of the dialog, like a standard dialog action bar.
• When there isn't, they stack vertically, right-aligned, instead of overflowing, so Close is always fully visible.

I also added a small gap between the changelog content and the buttons.

Verification

• flutter analyze on the file is clean.
• A throwaway widget test (not committed) laid out the old Row and the new OverflowBar inside a Dialog at 320 and 360dp widths. The Row overflowed at both; the OverflowBar didn't.

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