Add typed-query-selector/strict for compile-time CSS selector validation

[Copilot]

Enables strict mode type checking for querySelector calls to catch invalid CSS selectors at compile time rather than runtime.

Changes

• Added [email protected] as dev dependency
• Imported typed-query-selector/strict in global.d.ts to enable selector validation
• Wrapped existing RegExp interface augmentation in declare global block (required when file becomes a module)

Effect

Invalid selectors now produce TypeScript errors:

// Returns `never` type in strict mode - TypeScript error on usage
const el = document.querySelector('div[unclosed'); 

// Valid selectors get precise typing
const div = document.querySelector('div.container'); // HTMLDivElement | null

This prevents issues like malformed selectors reaching production (referenced in #120 and commit 1a04193).

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add typed-query-selector/strict locally to ensure selectors are valid</issue_title>
<issue_description>https://github.com/g-plane/typed-query-selector#strict-mode

This type should make TS fail if a selector is invalid. This would avoid:

• Add isClosedConversation #120 (comment)
• 1a04193

cc @yakov116 </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add typed-query-selector/strict locally to ensure selectors are valid #137

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