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

[Copilot]

• Install typed-query-selector as a dev dependency
• Add strict mode import to global.d.ts to enable compile-time selector validation
• Verify that existing selectors pass validation
• Run TypeScript compiler to ensure no errors
• Run tests to ensure everything works correctly
• Merge main branch and resolve conflicts

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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[fregante]

@copilot update branch and resolve merge conflicts

[fregante]

@copilot the $ and exists helpers also need to be updated, most likely using typeof document.querySelector and/or document.querySelector.bind(document) instead of the arrow function

[Copilot]

@copilot update branch and resolve merge conflicts

Branch updated and merge conflicts resolved in db9f599. The typed-query-selector dependency has been added alongside the new ts-morph and tsx dependencies from main.