Add decimal alignment to balance amounts using align_to_dot()

Implement proper decimal point alignment for all balance amounts
in the balance table using the existing align_to_dot() utility function.

This ensures that decimal points line up vertically within each column,
making the table more readable and consistent with other parts of the
application that use the same alignment utility.

Changes:
- Import align_to_dot from humanize module
- Align HBD/HP values in column 2 (Liquid, Savings, Stake)
- Align HIVE/VESTS values in column 3 (Liquid, Savings, Stake)
- Use existing utility instead of manual string splitting

Closes #514

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>