Follow up sanity fixes for editor maps, geocoding, and Discovery

[bwstefano]

Summary

This follow-up branch closes the baseline issues that were left out of the main sanity track and packages the work into four areas:

1. Editor sidebar and map runtime follow-ups

• keep the map, layer, and storymap editors on the Document sidebar instead of bouncing back to Block on selection
• load the map runtime CSS in the block-editor iframe and related sidebar contexts so the Mapbox GL missing-CSS warning stops appearing in the editor
• normalize the hidden and expanded Storymap slides settings panel widths

2. Post geocoding reliability

• stabilize the geocoding field state after selecting an address, dragging a marker, canceling, saving, and reopening
• keep the current address visible and actionable so new and existing points can be saved after drag or search updates
• add an accent-insensitive fallback for address search so queries such as São Paulo, Belém, and Amapá work without forcing users to strip diacritics manually

3. Discovery markers, hover sync, sharing, and filters

• switch Discovery GeoJSON features to stable per-point IDs while preserving the story/post ID in feature properties
• keep marker, cluster, View in map, and card hover states in sync across multi-point stories and clustered results
• scroll the stories list to the hovered marker or cluster and reflect list hover back onto markers or clusters in the map
• increase the initial Discovery fetch window so more geolocated posts appear before filters are applied
• replace Twitter and Facebook sharing with X and WhatsApp
• include active story filters and selected layers in shared Discovery URLs and restore that state when opening the shared link
• fix the tag-reset flow so removing a selected tag returns Discovery to the default result set
• restore normal layer application in Discovery after the shared-layer initialization changes

4. Documentation close-out

• remove the resolved baseline follow-ups from the upgrade report and smoke checklist
• close the stale override-governance note
• reclassify react-leaflet 5, PHPCS 4, and wp-cli PHP 8.5 noise as external monitoring paths instead of pending product bugs

Notes

• no REST or post-meta contract changes are introduced in the Discovery work; only the internal feature ID strategy changes
• this branch is intended to merge into codex/plugin-sanity-track

Testing

• git diff --check
• php scripts/check-php-compat.php
• PATH="/opt/homebrew/opt/node@24/bin:$PATH" npm run test:unit
• PATH="/opt/homebrew/opt/node@24/bin:$PATH" npm run build