chore: migrate to oxlint

[olivermrose]

No description provided.

[Copilot]

Pull request overview

This PR migrates the project’s JavaScript/TypeScript linting from ESLint to oxlint, updating config and adjusting code to satisfy the new linter rules across the SvelteKit/Tauri codebase.

Changes:

• Replace ESLint with oxlint (new oxlint.config.ts, updated package.json scripts/devDependencies, remove eslint.config.js).
• Mechanical refactors for lint compliance (e.g., sort() → toSorted(), add this: void where needed).
• Minor config/key reordering in Vite/Svelte config files.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
vite.config.js	Reorders config and keeps build.target: "esnext"/clearScreen in a new position.
svelte.config.js	Reorders preprocess within the config object.
src/routes/settings/+page.svelte	Uses toSorted() for category ordering.
src/lib/split-layout.ts	Uses toSorted() for candidate scoring without mutation.
src/lib/models/message/user-message.ts	Uses toSorted() in cached sorting paths.
src/lib/models/badge.ts	Adds this: void to a static method signature.
src/lib/components/ChannelList.svelte	Uses toSorted() in derived sorting/grouping logic.
src/lib/completer.svelte.ts	Uses toSorted() when sorting completion results.
src/lib/commands/twitch/vips.ts	Switches to toSorted() for VIP list output.
src/lib/commands/twitch/unban.ts	Adds this: void to exec signature.
src/lib/commands/twitch/mods.ts	Switches to toSorted() for moderator list output.
src/lib/commands/built-in/founders.ts	Switches to toSorted() for founders list output.
package.json	Updates lint scripts and replaces ESLint deps with oxlint deps.
oxlint.config.ts	Adds oxlint configuration (categories/options/rules).
eslint.config.js	Removes the old ESLint configuration.

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