Bugfix

[ABKQPO]

Summary

• Adds native Mermaid flowchart support with parsing, ELK-based layout, nested subgraphs, edge routing, arrow styles, node shapes, rich node content, copy actions, async layout warmup, and fallbacks for unsupported input.
• Improves Mermaid usability with panning and zooming refinements, reset-view controls, and much more detailed debug hit detection for nodes, edges, labels, and nested content.
• Adds navigation-tree expand and collapse controls:
  • Shift-clicking a page arrow expands all descendants when anything is still collapsed, or collapses the page and its descendants when already fully expanded.
  • The navigation context menu now provides global Expand All and Collapse All actions.
  • Navigation ordering is deterministic between guide reloads.
• Reworks guide search for large documentation packs:
  • Builds and warms an in-memory index in the background.
  • Prioritizes indexing while the user is actively searching.
  • Handles line breaks and split words correctly.
  • Produces cleaner snippets by removing Markdown and runtime formatting markers without exposing raw syntax.
  • Fixes search-screen state, button placement, stale debug targets, and result layout issues.
• Expands the site exporter so exported guides better match the in-game renderer:
  • Exports runtime GameScene content, captured scene textures, entities, recipes, graph content, and interactive item tooltips.
  • Improves Mermaid, flowchart, file-tree, blockquote, custom quote, Markdown runtime block, and recipe rendering.
  • Fixes exported scrolling, tab switching, tooltips, graph numeric formatting, and several CSS/runtime integration issues.
• Adds Better Questing guide links through the extensible GuideNH URI handling layer, including localized editor actions and the temporary compatibility mixin used until Better Questing exposes the registration API.
• Improves client-side preview stability:
  • Adds a client task scheduler to avoid opening-guide crashes caused by unsafe client work timing.
  • Updates AE2 cable preview connection checks and supports external grid parts such as P2P tunnels, Quartz Fiber, and Toggle Bus.
  • Keeps function graph tooltips consistent with the standard Minecraft tooltip renderer.
• Makes guide reload and resource handling more robust:
  • Avoids reload crashes from invalid frontmatter and malformed resource packs.
  • Reduces redundant resource-pack and ZipFile scans during guide reloads.
• Updates Chinese Markdown documentation for the added guide functionality.

Checklist

• I have tested this PR in DevEnv
• I have tested this PR in Fullpack
• This PR is in compliance with the GTNH AI Policy
• This PR requires another PR in order to merge