fix: add declare modifier to top-level function declarations in .d.ts files

[Copilot]

TypeScript error ts(1046) was raised across all declaration modules converted from ambient to proper .d.ts format in #1 — top-level function declarations require a declare or export modifier in non-ambient .d.ts files.

Changes

• All components/**/*.d.ts: Prepended declare to every top-level function declaration (182 files)
• Add declare to the const settings declaration in settings.d.ts

Before:

function Component(props: Props): JSX.Element;

After:

declare function Component(props: Props): JSX.Element;