Refactor main listener into modular handler files and remove jQuery global

[baimard]

Motivation

• Improve maintainability by splitting the large main_listener.js into focused handler modules for configuration, editable elements, products, selects and table actions.
• Remove the implicit global jQuery injection to reduce dependency surface and avoid relying on provided globals from webpack.

Description

• Added new handler modules: src/js/listener/handlers/configuration_handlers.js, editable_handlers.js, product_handlers.js, select_handlers.js, and table_handlers.js implementing focused event handling logic and utility functions such as openFolderPicker, saveEditableElement, duplicateItem, and updateLinkedListSelection.
• Rewrote src/js/listener/main_listener.js to import and wire the new handlers, register granular event listeners (click, dblclick, change, keydown, focusout, mouseover) and consolidate logic into small functions like handleBodyClick, handleBodyChange, and handleBodyKeydown.
• Removed jquery from devDependencies in package.json and eliminated the webpack.ProvidePlugin that injected jQuery globals from webpack.js to stop using implicit global jQuery.

Testing

• Ran a webpack build using the existing config (webpack --config webpack.js) and the build completed without errors.
• No automated unit tests were added or run as part of this change.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore jquery provisioning for $ usages

Removing the webpack ProvidePlugin leaves existing bundled code with unresolved $ references: globalConfiguration() is used by the app entry points and still reaches $ in src/js/modules/mainFunction.js (for example configureDT, path, and checkSelect), and the show pages call Client.getClientByIdDevis($("#devisid")...) directly. In a Nextcloud page that does not provide a global jQuery, those paths will now throw ReferenceError: $ is not defined at runtime, so keep the provider or replace the remaining $ calls with explicit imports/plain DOM APIs before removing it.

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