fix(cli): match lint test-file exclusion relative to scan root

[MarioCadenas]

Problem

appkit lint's isTestFile substring-matched "/tests/" against the absolute file path:

filePath.includes("/tests/")

Any ancestor directory named tests — e.g. an app scaffolded under ~/Developer/personal/tests/my-app — makes every file in the project match, so it's treated as a test file. Rules marked includeTests: false (no-variants-in-prod, no-as-any) are then silently skipped for the entire project, and appkit lint reports no violations even when they exist.

This defeats the no-variants-in-prod guardrail exactly where it matters: a leftover dev-only <Variants> block can ship to production while the lint stays green, purely because of an unlucky (and common) parent directory name.

Fix

Match against the path relative to the scan root, with path-segment boundaries, instead of a substring of the absolute path. rootDir is threaded from runLint → lintFile → isTestFile.

Verification

• tsc --noEmit on the changed file: clean.

• Behavioral before/after:

  scenario	old	new
  app under a tests/ ancestor (…/personal/tests/app/src/Foo.tsx)	true (bug)	false ✓
  real test file (src/foo.spec.tsx)	true	true ✓
  project-local tests/ dir (tests/smoke.ts)	true	true ✓
  normal source (src/App.tsx)	false	false ✓

Reproduced originally by scaffolding an app under a tests/ parent directory and observing no-variants-in-prod never fire on a real <Variants> block in the app source.

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📦 Bundle size report

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

✅ No size changes vs the baseline.

@databricks/appkit

npm tarball (packed): 753 KB — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	783 KB	273 KB
Type declarations	284 KB	97 KB
Source maps	1.5 MB	510 KB
Other	11 KB	3.7 KB
Total	2.6 MB	883 KB

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

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
.	85 KB	2.5 KB	88 KB	external	279 KB
./beta	40 KB	231 B	40 KB	external	119 KB
./type-generator	19 KB	0 B	19 KB	external	54 KB

Chunks:

Entry	Chunk	Load	Size (gz)
.	index.js	initial	81 KB
.	utils.js	initial	4.0 KB
.	remote-tunnel-manager.js	lazy	2.5 KB
./beta	beta.js	initial	30 KB
./beta	databricks.js	initial	5.8 KB
./beta	service-context.js	initial	3.2 KB
./beta	client-options.js	initial	220 B
./beta	databricks.js	lazy	128 B
./beta	index.js	lazy	103 B
./type-generator	index.js	initial	19 KB

@databricks/appkit-ui

npm tarball (packed): 295 KB — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	350 KB	116 KB
Type declarations	201 KB	72 KB
Source maps	669 KB	218 KB
CSS	16 KB	3.3 KB
Total	1.2 MB	410 KB

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	428 KB	49 KB	476 KB	1.3 MB	163 KB
./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	426 KB
./react	tslib	initial	2.1 KB
./react	apache-arrow	lazy	49 KB
./react/beta	beta.js	initial	20 B