Migrate to igniteui-grid-lite v0.3.1 with declarative columns API#12

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Copilot wants to merge 3 commits intomasterfrom

copilot/update-igniteui-grid-lite-version-again

Commits on Jan 5, 2026

Initial plan
Copilot
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Complete API migration to igniteui-grid-lite v0.3.1 with declarative columns

Copilot
and
damyanpetev
committed
Fix demo to remove initial filter expressions, build and validate working grid

Copilot
and
damyanpetev
committed