migrated cfp_flow from vue 2 to vue 3

[Saksham-Sirohi]

Fixes part of #359

Summary by Sourcery

Upgrade the cfp_flow frontend implementation to use Vue 3, modernizing component structure and reactivity patterns, and adjust related template and style handling.

Enhancements:

• Migrate cfp_flow JavaScript from Vue 2 to Vue 3, updating component registration and reactivity usage.

Build:

• Remove CSS compression for flow.css in the template.

[sourcery-ai]

Reviewer's Guide

This PR migrates the cfp_flow feature from Vue2 to Vue3 by switching to reactive state management and createApp-based initialization, modernizing component definitions and templates, and updating related static assets and the vendored Vue library.

Class diagram for updated Vue3 component structure in cfp_flow

classDiagram
    class FieldComponent {
        +template
        +props
        +data
        +computed
        +methods
    }
    class StepComponent {
        +template
        +props
        +data
        +computed
        +methods
    }
    class App {
        +template
        +data
        +computed
        +methods
    }
    App o-- FieldComponent : uses
    App o-- StepComponent : uses
    StepComponent o-- FieldComponent : uses

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File-Level Changes

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Change	Details	Files
Migrate flow initialization and state to Vue3 patterns	Replace Vue.observable with Vue.reactive for currentModal Switch from new Vue({el:…}) to Vue.createApp() and mount() Replace Vue.set() calls with direct property assignments	src/pretalx/static/orga/js/cfp_flow.js
Refactor field and step components to modern Vue3 syntax	Convert Vue.component(...) into const component objects Register components via app.component() instead of global Vue.component() Wrap v-for elements in and refine v-if usage	src/pretalx/static/orga/js/cfp_flow.js	Remove Django CSS compression and adjust flow.css	Remove {% compress %} tags around flow.css in template Update flow.html to link flow.css directly Add width: 100% rule in flow.css stylesheet	src/pretalx/orga/templates/orga/cfp/flow.html src/pretalx/static/orga/css/flow.css	Upgrade vendored Vue library to Vue3	Replace old Vue2 vendor build with latest Vue3 vue.min.js	src/pretalx/static/vendored/vue.min.js

[mariobehling]

Please share screenshots showing the feature functioning .

[hongquan]

Please add a blank line at the end of file.

[hongquan]

@Saksham-Sirohi After the rewrite of Git history in FOSSASIA repo, your PR is now detected as 433 files difference from the target branch. Please rebase (git rebase command) your branch against the main branch and force push again.