demo: add search panel demo base content

[pedropaulovc]

Adding base content for search panel split focus demo

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Iterations captured: 1
Last updated: 2026-01-25T19:29:28.000Z
Artifact: 5250177365
Run ID: 21338268030

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[Copilot]

Pull request overview

This PR adds base content for a new E2E test demo that demonstrates the search panel split focus feature with Left/Right indicators. The demo file contains simple TypeScript functions and constants with comments explicitly marking them as "ORIGINAL" and "LEFT" side content, which will be used to test the split view functionality.

Changes:

• Added a new demo directory search-panel-demo/ with a TypeScript file containing base content for testing the split focus feature

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