Assert the altitude prefill from /api/elevation in the E2E suite

[Babissimo]

Why

SearchForm.tsx looks elevation up as soon as coordinates are typed and writes the answer into the altitude field. Nothing in this repo asserted that behaviour: SearchForm.test.tsx and this suite both stub /api/elevation, the stub's own comment says it is there so the request cannot reject noisily, and deploy/smoke-test.sh only proves the route answers. The one test that covered it lived in retina-server's Playwright suite (auto-fetches elevation when lat/lon are entered) and was deleted there in offworldlabs/retina-server#387, because since the Origin Rule flip that repo no longer serves this UI.

What

One test in frontend/e2e/tower-finder.spec.ts, in the search-form group: fill latitude and longitude, expect the altitude field to read 43, the value the file-level beforeEach mock returns. Stronger than the original, which ran unmocked and accepted either a populated field or a request having fired.

Verified

• npm run test:e2e against the built dist: 15 passed (the 14 existing tests plus this one).
• Mutation check: with the mock changed to 99 the test fails with Expected: "43", Received: "99", so the assertion is live.
• npm run typecheck clean.

ClickUp: Playwright's frontend host points at the rule-captured towers hostnames.

🤖 Generated with Claude Code

[claude]

Claude finished @Babissimo's task in 1m 15s —— View job

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Review: PR #34 — Assert altitude prefill from /api/elevation

• Gather context (PR body, diff)
• Read changed file and surrounding test suite
• Verify claims (mock value, test structure)
• Post review feedback

Summary: Small, well-scoped addition — a single new test in the "search form" describe block (frontend/e2e/tower-finder.spec.ts:168-175).

Verified:

• The file-level beforeEach (tower-finder.spec.ts:53-61) stubs /api/elevation to return elevation_m: 43, matching the new test's expectation of "43" on the altitude field.
• Cross-checked SearchForm.tsx:61-84: elevation lookup is debounced (400ms) via useEffect on [lat, lon], independent of form submission — consistent with the PR's claim that the field populates without clicking submit.
• Confirmed via grep that SearchForm.test.tsx stubs /api/elevation only to prevent noisy rejections and never asserts on the resulting altitude value (as the PR description states), so this is genuinely new coverage, not a duplicate.
• The assertion uses expect(...).toHaveValue(...), which polls/retries — appropriate for the debounced update, no manual wait/sleep needed and no flakiness risk from timing.
• Comment style, coordinate values, and structure match the existing tests in the same describe block (e.g. tower-finder.spec.ts:98-120).

Not independently re-run: npm run test:e2e and npm run typecheck require sandboxed shell commands not permitted in this environment, so I relied on static review plus the PR author's reported verification (15/15 passing, mutation check on the mock value, clean typecheck).

Verdict: No issues found. The change is minimal, targeted, and does exactly what the PR description claims — no requested changes.