fix(table): flatten nested objects to dot-notation, safe multi-byte truncation (fixes #40 #43)

[jpoehnelt]

Fixes #40
Fixes #43

Changes

Nested Object Flattening (issue #40)

• Added flatten_object() helper that recursively converts {"user": {"name": "Alice"}} into [("user.name", "Alice")]
• format_table_page and format_array_as_table now use flattened rows, so nested API response objects appear as readable dot-notation columns instead of raw JSON blobs
• Applies to both single-object tables (drive about get) and array tables (drive files list)

Multi-byte Truncation Panic Fix (issue #43)

• Replaced byte-slice truncation &c[..widths[i]-1] with char-based: c.chars().take(n).collect::<String>()
• Column widths are now tracked and compared by Unicode character count, not byte length
• Custom per-char padding replaces format!("{:width$}") which was also byte-based

Tests Added

• test_format_table_nested_object_flattened: verifies dot-notation keys, no raw JSON blobs
• test_format_table_nested_objects_in_array: verifies flattening in array rows
• test_format_table_multibyte_truncation_does_not_panic: 70 emojis (4 bytes each) — no panic
• test_format_table_multibyte_exact_boundary: accented characters do not corrupt output

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