Problem: PlantUML (`.puml`) diagrams have no built-in preview support, and Neovim lacks filetype detection for PlantUML files. Solution: Add a `plantuml` preset that compiles to SVG via `plantuml -tsvg`, with an error parser for `Error line N` diagnostics. Register `.puml` and `.pu` extensions via `vim.filetype.add` when the preset is configured. Add `plantuml` to the nix dev shell. |
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