Added Append method for tables

[djthorpe]

This pull request enhances the table component in the TUI package to support buffered row management, allowing rows to be appended and automatically flushed on write. It also introduces new tests to ensure the correct behavior of row buffering and flushing.

Enhancements to table row management:

• Added a rows field to the table struct to buffer appended rows before rendering.
• Implemented an Append method on table to add rows to the buffer.
• Modified the Write method to use buffered rows, flush them after writing, and support writing without passing rows explicitly.

Testing improvements:

• Updated existing tests to use the new Append method and verify newline handling.
• Added a new test TestTableWriteFlushesBufferedRows to confirm that buffered rows are correctly flushed after writing.

[Copilot]

Pull request overview

This pull request updates the TUI table helper to support buffering rows on the table instance (via Append) and rendering them later (via Write), instead of requiring all rows to be passed directly to Write.

Changes:

• Added an internal rows []T buffer plus a new Append(rows ...T) method on table.
• Updated Write to render from buffered rows (and to accept optional rows to append before rendering), then flush the buffer after writing.
• Extended tests to validate newline behavior and that buffered rows are flushed after a write.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
pkg/tui/table.go	Adds buffered row storage with Append, updates Write to render/flush buffered rows.
pkg/tui/table_test.go	Updates tests to use Append and adds a flush regression test for buffered rows.

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