Add test coverage for drawCell with null align parameter

[Copilot]

The existing tests only covered drawCell when an Align enum value was explicitly provided, leaving the default null case untested.

Changes

• Added drawCellWithNullAlign() test that verifies the method correctly omits the ^FB alignment command when no alignment is specified

// Before: only tested with explicit alignment
$this->driver->drawCell(100, 10, 'Hello World', true, true, Align::CENTER);
// Output includes: ^FB90,7.5,0,C

// Now also tested: default null alignment
$this->driver->drawCell(100, 10, 'Hello World', true, true);
// Output correctly omits ^FB command

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