vendor m3e-canvas 5c83ac6, with the import rewrite scripted

upstream imports through a @/ alias, and this platform already binds
@/* to src/apps/officer-web and @/components/* to its own shared
components — so an unrewritten import resolves to the WRONG module
rather than failing. the rewrite is mechanical and lives in
scripts/vendor.sh so a re-vendor produces a readable diff.

lib/ai.ts and AiPanel are vendored despite being unwanted: deleting them
meant editing vendored code, and Canvas.tsx references them throughout.
a faithful copy carrying an unused module beats a doctored one.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,2 @@
+node_modules/
+*.log