Modernize ExtJS 3.4.1 implementation with enhanced browser compatibility and performance improvements#3

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copilot/fix-85e07af2-222b-4d73-a61c-481c45563f7dtvheadend/tvheadend-test:copilot/fix-85e07af2-222b-4d73-a61c-481c45563f7dCopy head branch name to clipboard