Fix Repeated Initialization and Dynamic Component Setup Issues

[huajiqaq]

#4364
I have created a PR with the following fixes and improvements:

1. Bug Fixes
   data-table: Fixed an issue where handling repeated initialization incorrectly cleared previously created properties when returning existing instances
   pull-to-refresh: Prevented possible duplicate initialization and ensured MD theme completion events are properly triggered
   toolbar: Added warning when scrollable property is active but tab width measurement is zero
   Initialization checks: Added duplicate initialization guards to several components
2. New Features (Vue/React/Svelte)
   page-content: PTR and infinite loading will now automatically initialize when set dynamically after pageInit
   tabs: Swiper will now automatically initialize when swipeable property is set dynamically after pageInit (added swiper init method to support this)
   Note: These dynamic initialization features are not implemented for vanilla JavaScript components since they lack mounted lifecycle hooks

[nolimits4web]

This issue was incorrectly closed on 2026-05-19 by a compromised credential (Shai-Hulud npm supply-chain worm). Reopening — apologies for the noise.