Enhance Svelte syntax highlighting and markdown support

[realfakenerd]

Description

This PR refines Tree-sitter queries (outline.scm, highlights.scm, and injections.scm) to make editor navigation and syntax highlighting significantly cleaner and more precise.

Changes

1. Markdown Injection for Component Docs (languages/svelte/injections.scm)

• Resolved the downstream TODO by injecting the markdown parser into HTML comment blocks that contain the @component directive, enabling rich text highlighting inside component documentation.

2. Structural & Clean Code Navigation (languages/svelte/outline.scm)

• HTML Noise Reduction: Filtered out generic HTML tags (e.g., div, span, p) from the Symbol Outline panel.
• Component Focus: Modified queries to exclusively track Svelte Components (names starting with uppercase letters ^[A-Z]).
• Framework Structural Blocks: Added native <svelte:*> tags and missing framework logical statements like key_statement ({#key ...}) to ensure proper workspace indexing.

3. High-Contrast Syntax Highlighting (languages/svelte/highlights.scm)

• Native Framework Elements: Mapped <svelte:*> built-in structural tags (like <svelte:head>) to @keyword so they stand out visually from standard HTML tags.
• Functional Directives: Isolated core Svelte element directives (bind:, on:, class:, use:, etc.) using regex and styled them as @keyword to cleanly differentiate logic from static markup.

[ghostdevv]

Hey, looks like CI is failing if you could take a look? If possible can you also include some before/after screenshots?