Feat various improvements

[LordTermor]

Small features and fixes here and there

[Copilot]

Pull request overview

This PR adds support for imperative JavaScript code in QML files, introduces syntax error diagnostics, and improves the completion provider's error handling. The changes follow the codebase's vertical architecture pattern by adding new classification rules for JavaScript contexts and a new diagnostics provider.

Key changes:

• Added semantic token classification for JavaScript expressions (console.log, Math operations, ternary operators, etc.)
• Introduced real-time syntax error diagnostics via tree-sitter parsing
• Enhanced completion provider to avoid suggesting completions in broken syntax contexts

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test-workspace/ImportTest.qml	Adds onClicked handler test case for button interaction
test-workspace/ImperativeTest.qml	Comprehensive new test file covering JavaScript expressions, Math/console APIs, ternary operators, and imperative bindings
syntaxes/qml.tmLanguage.json	Adds TextMate grammar patterns for operators (ternary, comparison, logical, arithmetic, bitwise) to improve syntax highlighting
src/providers/semanticTokens/tokenClassifier.ts	Reorganizes rule application to prioritize QML rules, then imperative rules, with proper fallback chain
src/providers/semanticTokens/imperativeClassificationRules.ts	New file implementing the Rules pattern for JavaScript context classification (builtins, member expressions, variables)
src/providers/semanticTokens/classificationRules.ts	Refactors rules into qmlRules array and delegates JavaScript contexts to imperative rules
src/providers/semanticTokens/builtinTypes.ts	Adds JavaScript global objects (console, Math, JSON, etc.) and their methods/properties for semantic classification
src/providers/diagnostics/syntaxDiagnosticsProvider.ts	New provider implementing real-time syntax error detection and reporting using tree-sitter ERROR nodes
src/providers/completion/completionProvider.ts	Adds error context detection to prevent completions when syntax is broken
src/indexer/shared/CacheValidator.ts	Removes unused getFileModTime function
src/extension.ts	Registers the new syntax diagnostics provider during extension activation