[jay23606]

Bug

SAT centres in North American cities shared slugs with unrelated cities, mixing their city pages and map bounds. Two entries also had coordinates that did not match their verified addresses.

Change

Qualified the affected city slugs by state or province, kept the Canary Islands school under arona, corrected the Reading, Pennsylvania and Southport, Queensland coordinates and map links, and documented the same-name slug rule.

Testing

• npx vitest run src/lib/places.test.ts (fails before the data change and passes after)
• npm run validate

Regression test: fails on base (/expected 'aberdeen' to be 'aberdeen_maryland'/), passes on fix (npx vitest run src/lib/places.test.ts)

Fixes #284

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