upgrade examples to meteor 3.5.2-beta.0

[nachocodoner]

Summary

• upgrade six tracked official Rspack examples to Meteor 3.5.2-beta.0
• align @meteorjs/rspack with 2.2.0-beta.0 and regenerate package locks
• record Modern-Tools build-context ignores and update example metadata

Validation

• verified meteor --version reports 3.5.2-beta.0 in every upgraded example
• server tests: Complex Todos (5), NFT Marketplace (2), Notes Offline (9), Parties (5), Task Manager (6), Tic Tac Toe (6)
• browser tests: Complex Todos Cypress (15), Notes Offline Playwright (13), Parties Playwright (8), Task Manager Playwright (9), Tic Tac Toe Playwright (6)
• source lint checks returned zero errors; existing warnings remain
• git diff --check and JSON/lockfile parsing passed

NFT Marketplace has no configured browser end-to-end suite.