Upgrade ESLint & Prettier, pin JS dependencies

[bobvandevijver]

Upgrades ESLint and Prettier to more recent versions, update their configuration and fix newly found issues. This in preparation of the Vue 3 upgrade.

Also bumps Vue 2 to latest, and pin the dependencies so unwanted upgrades are not made by mistake.

[Copilot]

Pull request overview

Upgrades the JS tooling stack (ESLint + Prettier) and pins runtime dependencies to stabilize installs, as preparation for the upcoming Vue 3 upgrade.

Changes:

• Pin dependencies to exact versions and bump Vue 2 to latest patch.
• Migrate ESLint to flat config (eslint.config.mjs) and update lint/prettier scripts.
• Apply formatting/compatibility edits across Vue/JS source (slot syntax, style attribute formatting, etc.).

Reviewed changes

Copilot reviewed 19 out of 26 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
package.json	Pins runtime deps, bumps Vue, updates ESLint/Prettier toolchain and npm scripts.
package-lock.json	Lockfile refresh for upgraded/pinned dependencies and tooling.
eslint.config.mjs	New ESLint v9 flat config with Vue + Prettier + Cypress integration.
assets/js/app/toolbar/Components/Toolbar.vue	Prettier-driven HTML/style formatting change.
assets/js/app/save-on-ctrl-s.js	Prettier-driven function spacing formatting.
assets/js/app/patience-is-a-virtue.js	Prettier-driven function spacing formatting.
assets/js/app/notifications/index.js	Prettier-driven function spacing formatting.
assets/js/app/login/index.js	Renames global component registrations.
assets/js/app/listing/Components/Table/Row/index.vue	Prettier-driven inline style formatting.
assets/js/app/listing/Components/Table/Row/_Actions.vue	Prettier-driven inline style formatting.
assets/js/app/listing/Components/SelectBox.vue	Migrates deprecated slot syntax to v-slot shorthand.
assets/js/app/editor/index.js	Renames globally registered editor components.
assets/js/app/editor/Components/Select.vue	Slot syntax updates and minor formatting.
assets/js/app/editor/Components/Password.vue	Prettier-driven function spacing formatting.
assets/js/app/editor/Components/Language.vue	Slot syntax updates.
assets/js/app/editor/Components/Imagelist.vue	Changes child event listener names to kebab-case; other formatting.
assets/js/app/editor/Components/Image.vue	Adds emits declaration and formatting tweaks.
assets/js/app/editor/Components/Filelist.vue	Changes child event listener names to kebab-case; other formatting.
assets/js/app/editor/Components/File.vue	Adds emits declaration and formatting tweaks.
assets/js/app/editor/Components/Embed.vue	Prettier-driven function spacing formatting.
assets/js/app/editor/Components/Date.vue	Removes required: true from a prop that already has a default.
assets/js/app/editor/Components/Collection.vue	Uses <component :is> syntax and formatting updates.
assets/js/app/common.js	Prettier-driven function spacing + minor chaining formatting.
assets/js/app/ajax-save.js	Prettier-driven function spacing formatting.
.prettierrc	Updates Prettier options and ordering.
.eslintrc.js	Removes legacy ESLint config (replaced by flat config).

Comments suppressed due to low confidence (1)

assets/js/app/editor/Components/File.vue:180

• This component emits moveFileUp/moveFileDown (camelCase) but parent templates in this PR were changed to listen for move-file-up/move-file-down. These names won't match, so the handlers won't run. Align emitted event names and template listeners (prefer kebab-case).

    emits: ['moveFileUp', 'moveFileDown', 'remove'],
    data() {
        return {
            isDragging: false,
            dragCount: 0,

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