Adds docs/PPTX_IMPORT_FEATURE.md as the canonical plan for the next
big arc: a phased editable .pptx importer that lands PowerPoint decks
as editable Artstr deck JSON.
Key decisions baked in:
- Images and unsupported objects (charts / SmartArt / tables / video)
import as placeholder image layers pointing at a hardcoded URL
(postimg.cc for now). Original PowerPoint media filenames carry
over into the layer name so the user can correlate placeholders
with their source deck.
- fflate (~10 KB) vendored as src/vendor/fflate.min.js. JSZip is too
heavy for the single-file ethos.
- Importer code lives in src/pptx-importer.js as an IIFE that
exposes window.ArtstrPptxImporter. The Import PPTX button
dynamically injects both scripts on first click, so the main
index.html bundle does not grow for the 90 % of users who never
import a PPTX.
- Notes folded into Phase 2 alongside text (single extra relationship
lookup, Presenter Mode already renders slide.notes).
- No Blossom / NIP-96 prereq, no base64 bloat, no publish-size guard.
Imported decks are normal Artstr deck payloads with remote URLs.
- Import-only for this arc. PPTX export (Artstr -> .pptx) is a
separate later arc with its own complexity.
TODO.md gets a Drafted-but-unbuilt entry pointing at the new spec.
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