fix: Obsidian community plugin compliance issues

- Remove 'Obsidian' from manifest description (redundant)
- Replace deprecated getUnpinnedLeaf() with getLeaf(false)
- Use new Setting().setHeading() instead of direct HTML elements
- Remove unused App import from GraphAnalyzer
- Fix type safety: remove 'any' types and add proper error handling
- Replace builtin-modules with alternative (using node built-ins instead)
- Remove redundant plugin names from command names
- Fix async/await handling and promise chains
- Remove deprecated setDynamicTooltip() call
- Add void operator to intentionally unhandled promises