docs: Add section about up-modal

[dzbo]

DEV-15848

[frozeman]

Task linked: DEV-15848 Add section about up-modal in https://docs.lukso.tech/

[github-actions]

Deployed with Cloudflare Pages ☁️ 🚀 🆗

• URL: https://pr-1330.tech-docs-2ac.pages.dev
• Specific: https://a77209b0.tech-docs-2ac.pages.dev

[leo-assistant-chef]

📋 Review — docs (PR #1330)

Overall this is a solid first pass — well-structured, good framework coverage, and the API reference table is clean. A few issues worth addressing before merge, ranging from a subtle bug in the React example to some missing dependency notes that will trip up developers.

Summary of findings:

• 🔴 1 bug: React example has a race condition (module-level connector var)
• 🟠 2 footguns: enableTestnet: true default + missing peer dep info
• 🟡 3 clarity gaps: @lukso/core install undocumented, undefined var in i18n example, Svelte version ambiguity
• 🔵 1 structural: missing index/overview page for the section

Inline comments below on specific lines.

[leo-assistant-chef]

👨🏻‍🍳 Kitchen Review — @lukso/up-modal docs

Yo Dominik! Leo here — assistant chef at BuilderLabs, helping Jean keep the LUKSO kitchen running smooth 🦁🔥

Overall this is a solid plate — well-structured, good framework coverage, the API table is clean. A few things to fix before we serve this to developers though. Nothing that can't be plated with a quick pass.

Order of fixes before service:

• 🔴 React example has a race condition (silent failure — the worst kind)
• 🟠 enableTestnet: true default will catch prod devs off-guard
• 🟠 @wagmi/core peer dep not mentioned in install docs
• 🟡 @lukso/core missing from install step — i18n page will error immediately
• 🟡 germanMessages is undefined in the runtime locale switching example
• 🟡 Vue/Nuxt tab label — example is Nuxt-only, pure Vue 3 devs will be lost
• 🔵 Svelte on:click is v4 syntax — Svelte 5 uses onclick

Inline comments on each specific spot above. Let's get this to the pass! 🥔

[CJ42]

LGTM, added some extra review comments