feat(shared): migrate the appkit CLI off the legacy workspace client

[MarioCadenas]

Part of the migration off @databricks/sdk-experimental onto the modular @databricks/sdk-* SDK (see #562). Base: feat/modular-sdk-integration.

Changes

feat(shared): migrate the appkit CLI off the legacy workspace client

doctor and the registry picker now use the facade's modular clients
(warehouses, jobs, genie, currentUser) and its raw request() seam for
services with no modular client yet (serving, volumes, vector search,
UC functions, connections, database, experiments, apps).

• Profile host is read via sdk-core profiles resolve (disableEnv), exposed
  from the facade as resolveProfile.
• Resolved host comes from getHost(), which needs no network, so it is
  also shown when credentials are rejected. The ConfigError host= parsing
  is gone.
• Existence probes classify both ApiError shapes (statusCode/errorCode and
  httpStatusCode/code), so NOT_FOUND/INVALID_VALUE/ACCESS_DENIED are kept.
• Auth hints also match the sdk-core "profile not found" and "Host is
  required" messages.
• The Lakebase probe hands createLakebasePool a legacy-shaped adapter,
  since that package calls currentUser.me() with no argument.

Draft: implemented by an agent; needs review and a deployed SP + OBO check before it's marked ready.

This pull request and its description were written by Isaac.

[github-actions]

📦 Bundle size report

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

@databricks/appkit

npm tarball (packed): 1.2 MB (+32 KB) — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	1.3 MB (+32 KB)	458 KB (+11 KB)
Type declarations	465 KB (+9.3 KB)	169 KB (+3.2 KB)
Source maps	2.5 MB (+67 KB)	858 KB (+21 KB)
Other	11 KB	3.7 KB
Total	4.2 MB (+107 KB)	1.5 MB (+35 KB)

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

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
.	106 KB (+4.0 KB)	2.5 KB (+1 B)	109 KB (+4.0 KB)	external	344 KB (+12 KB)
./beta	102 KB (+3.9 KB)	483 B (-2 B)	103 KB (+3.9 KB)	external	308 KB (+11 KB)
./testing	45 KB (+3.5 KB)	32 KB (-2 B)	78 KB (+3.5 KB)	external	225 KB (+10 KB)
./tsdown	520 B	0 B	520 B	external	813 B
./type-generator	26 KB (+2.9 KB)	0 B	26 KB (+2.9 KB)	external	75 KB (+8.2 KB)

Chunks:

Entry	Chunk	Load	Size (gz)
.	index.js	initial	101 KB
.	utils.js	initial	4.6 KB
.	remote-tunnel-manager.js	lazy	2.5 KB
./beta	beta.js	initial	82 KB
./beta	modular.js	initial	6.1 KB
./beta	stream-manager.js	initial	5.9 KB
./beta	service-context.js	initial	4.2 KB
./beta	databricks.js	initial	3.3 KB
./beta	client.js	initial	652 B
./beta	index.js	initial	20 B
./beta	supervisor-api.js	lazy	192 B
./beta	databricks.js	lazy	176 B
./beta	index.js	lazy	115 B
./testing	manifest.js	initial	32 KB
./testing	index.js	initial	10 KB
./testing	wide-event-emitter.js	initial	2.9 KB
./testing	index.js	lazy	28 KB
./testing	remote-tunnel-manager.js	lazy	2.5 KB
./testing	utils.js	lazy	1.8 KB
./tsdown	index.js	initial	520 B
./type-generator	index.js	initial	26 KB

@databricks/appkit-ui

npm tarball (packed): 397 KB (+630 B) — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	429 KB (+235 B)	147 KB (+108 B)
Type declarations	267 KB (+1.2 KB)	99 KB (+421 B)
Source maps	853 KB (+314 B)	286 KB (+143 B)
CSS	16 KB	3.2 KB
Total	1.5 MB (+1.7 KB)	534 KB (+672 B)

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

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
./js	5.3 KB	49 KB	55 KB	208 KB	14 KB
./js/beta	2.1 KB	0 B	2.1 KB	0 B	5.0 KB
./react	433 KB (+12 B)	49 KB	481 KB (+12 B)	1.3 MB	177 KB (+41 B)
./react/beta	4.9 KB	0 B	4.9 KB	0 B	12 KB

Chunks:

Entry	Chunk	Load	Size (gz)
./js	index.js	initial	5.2 KB
./js	chunk	initial	120 B
./js	apache-arrow	lazy	49 KB
./js/beta	beta.js	initial	2.1 KB
./react	index.js	initial	431 KB
./react	tslib	initial	2.1 KB
./react	apache-arrow	lazy	49 KB
./react/beta	beta.js	initial	4.9 KB

[github-actions]

🤖 AppKit PR bot

🔬 Run evals

Start an eval for this PR from the evals-monitor app: Go to Evals Monitor →

📦 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 38918731191 -R databricks/appkit -n appkit-template-0.88.1-pr.7350ba3-feat-modular-cli-643 -D appkit-pr-643 \
  && unzip -o "appkit-pr-643/appkit-template-0.88.1-pr.7350ba3-feat-modular-cli-643.zip" -d "appkit-pr-643" \
  && databricks apps init --template "appkit-pr-643"

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.