chore: remove unused imports and local helpers

Drop module-local helpers that nothing calls (linkAbort, summarize,
stringOption, summarizeEntity and the polygonCenter, propertyObject and
unwrapProperties helpers only it used, CALLOUT_DOT_SIZE_PX) and unused
import specifiers in runtime modules, tests, QA scripts and tools.

None of the removed bindings is exported. Re-exports such as the ALPR
policy constants and every package export are unchanged.

src/sharelink.celestial.test.mjs

@@ -7,7 +7,6 @@ import { _claimContextVisualAuthority, setContextMode } from './ui/contextAction
 import { _initGlobalContextPanel } from './ui/contextBindings.js';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
-import fs from 'node:fs';
 import { ShareLinkManager, decodeShareCreatedAtMs } from './sharelink.js';
 import { createDefaultLayerState } from './data/layerState.js';