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/layers/transit/ingestion.js

@@ -9,7 +9,6 @@ import {
   FEED_STALE_AFTER_MS,
   MAX_VEHICLES_TOTAL,
   MISSED_POLLS_TO_DROP,
-  TRANSIT_POLL_MS,
   isStaleVehicleFix,
   transitVehicleKey,
   vehicleReportTimeMs,

src/layers/transit/lifecycle.test.mjs

@@ -6,7 +6,6 @@ import {
   FEED_EVICT_AFTER_MS,
   FEED_STALE_AFTER_MS,
   MISSED_POLLS_TO_DROP,
-  SELECTED_CARD_REFRESH_MS,
   TRANSIT_POLL_MS,
   VEHICLE_MAX_FIX_AGE_MS,
 } from './policy.js';

src/layers/transit/movement.test.mjs

@@ -9,7 +9,7 @@ import {
   displacementPlausible,
 } from './movement.js';
 import { buildTransitSelectionCopy } from './policy.js';
-import { seek, sampleAt } from '../../data/contactPlayback.js';
+import { sampleAt } from '../../data/contactPlayback.js';
 const entry = () => {
   const e = { mode: 'bus', modeInferred: false, courseDeg: null };
   initializePlayback(e);

src/layers/transit/rendering.js

@@ -22,7 +22,6 @@ import {
 import {
   MARKER_PIXEL_SIZE,
   ROTATION_REFRESH_MS,
-  SELECTED_CARD_REFRESH_MS,
   VISIBILITY_REFRESH_MS,
   SELECTED_PIXEL_SIZE,
   TRANSIT_MODE_COLORS,