Carlos Gutierrez 0d1aa591e5 perf: add caching system for fast graph loading ...

Major performance improvements for graph visualization:

Cache System:
- Add cache.lua module that stores parsed links/tags per file
- Only re-parse files that have been modified (mtime check)
- Cache stored in .ideadrop-graph-cache.json in idea_dir
- Fast file scanning using vim.fs.find when available

Layout Optimizations:
- Reduce max iterations from 300 to 100
- Faster convergence with adjusted parameters
- Barnes-Hut approximation for large graphs (100+ nodes)
- Cache math functions locally for speed
- Skip distant node pairs in repulsion calculation
- Reuse visible_nodes array across iterations

New Commands:
- :IdeaGraph rebuild - Force full cache rebuild
- :IdeaGraphClearCache - Clear cache file

This makes opening the graph nearly instant for previously
scanned vaults, similar to Obsidian's behavior.

2026-01-10 23:18:49 -05:00

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