revert: relocate typegen cache to committed .appkit/ dir

[MarioCadenas]

Reverts #502

[github-actions]

📦 Bundle size report

Compared against bundle-size-baseline.json (main).

@databricks/appkit

npm tarball (packed): 797 KB (+34 KB) — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	820 KB (+29 KB)	286 KB (+9.9 KB)
Type declarations	302 KB (+17 KB)	103 KB (+5.9 KB)
Source maps	1.6 MB (+65 KB)	536 KB (+21 KB)
Other	11 KB	3.7 KB
Total	2.7 MB (+110 KB)	929 KB (+37 KB)

Per-entry composition (own code — deps external (as shipped))

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
.	86 KB (+10 B)	2.5 KB	89 KB (+10 B)	external	281 KB (+42 B)
./beta	44 KB (+4.6 KB)	429 B (+198 B)	45 KB (+4.8 KB)	external	129 KB (+9.5 KB)
./type-generator	19 KB	0 B	19 KB	external	54 KB

Chunks:

Entry	Chunk	Load	Size (gz)
.	index.js	initial	82 KB
.	utils.js	initial	4.0 KB
.	remote-tunnel-manager.js	lazy	2.5 KB
./beta	beta.js	initial	29 KB
./beta	stream-manager.js	initial	5.8 KB
./beta	wide-event-emitter.js	initial	3.2 KB
./beta	databricks.js	initial	3.0 KB
./beta	configuration.js	initial	2.1 KB
./beta	service-context.js	initial	1.3 KB
./beta	client-options.js	initial	220 B
./beta	supervisor-api.js	lazy	184 B
./beta	databricks.js	lazy	132 B
./beta	index.js	lazy	113 B
./type-generator	index.js	initial	19 KB

@databricks/appkit-ui

npm tarball (packed): 305 KB (+101 B) — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	360 KB (+390 B)	119 KB (+60 B)
Type declarations	205 KB	74 KB
Source maps	686 KB (+390 B)	224 KB (+66 B)
CSS	16 KB	3.3 KB
Total	1.2 MB (+780 B)	422 KB (+126 B)

Per-entry composition (consumer bundle — deps bundled, peerDeps external)

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
./js	4.3 KB	49 KB	54 KB	208 KB	12 KB
./js/beta	20 B	0 B	20 B	0 B	0 B
./react	429 KB (+55 B)	49 KB	478 KB (+55 B)	1.3 MB	168 KB (+390 B)
./react/beta	20 B	0 B	20 B	0 B	0 B

Chunks:

Entry	Chunk	Load	Size (gz)
./js	index.js	initial	4.2 KB
./js	chunk	initial	120 B
./js	apache-arrow	lazy	49 KB
./js/beta	beta.js	initial	20 B
./react	index.js	initial	427 KB
./react	tslib	initial	2.1 KB
./react	apache-arrow	lazy	49 KB
./react/beta	beta.js	initial	20 B

[github-actions]

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📦 Try this PR's app template

Scaffolds a new app from this PR's SDK build. Run it in any folder (requires the GitHub CLI — gh auth login — and the Databricks CLI):

gh run download 30819766101 -R databricks/appkit -n appkit-template-0.48.0-pr.9601c6f-revert-502-move-typegen-509 -D appkit-pr-509 \
  && unzip -o "appkit-pr-509/appkit-template-0.48.0-pr.9601c6f-revert-502-move-typegen-509.zip" -d "appkit-pr-509" \
  && databricks apps init --template "appkit-pr-509"

The template pins @databricks/appkit and @databricks/appkit-ui to tarballs built from this branch, so the scaffolded app runs against this PR's code.