feat: add regional bikeways, fix trail hover rendering

[fatherlinux]

Summary

• New trail POIs with OSM geometry and Biking activity: Cleveland Lakefront Bikeway (17mi), Cleveland Foundation Centennial Trail, Bike & Hike Trail (33mi), Portage Hike & Bike Trail (11mi)
• Updated trails: Ohio & Erie Canal Towpath Trail (full 110mi geometry replaces stub), Mud Brook Greenway Trail (added Biking activity)
• Bug fix: Trail hover rendering — replaced CSS drop-shadow filter with direct stroke color override for SVG paths. The filter forced browsers to composite all <path> elements in <g> groups, defeating Leaflet's viewport clipping and rendering distant MultiLineString segments as stray fragments during hover.
• Feature: Trails with matching activities now show when their activity filter is active (e.g. clicking Biking shows biking trails even if the Trails toggle is off)

The Cleveland Lakefront Bikeway serves as the news target for the Euclid Beach Connector project (under construction 2026-2027).

Test plan

• Navigate to /cleveland-lakefront-bikeway — verify trail renders along Edgewater lakefront
• Click None then Biking in POI panel — verify all biking trails appear (CLB, Towpath, Bike & Hike, Centennial, Portage, Freedom)
• Hover trails with MultiLineString geometry (Keystone Loop, CLB) — verify NO stray fragments appear
• Hover marker icons — verify blue drop-shadow glow still works
• Verify Towpath renders full length from Cleveland to south of New Philadelphia

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request adds new trail POIs (Cleveland Lakefront Bikeway and Portage Hike & Bike Trail) via database migrations, documents extensive park boundary data in the boundaries README, and updates the map frontend to support highlighting and filtering of linear features. The code review identified two key issues: first, a SQL migration update condition for the Mud Brook Greenway Trail is too restrictive and may silently skip updating existing records; second, an unconditional check in the map bounds tracker defeats a performance optimization by always enabling linear features in filtered mode, which should instead be restricted to active activity filters.

[gemini-code-assist]

The condition AND (primary_activities IS NULL OR primary_activities = '') will prevent this update from running if the Mud Brook Greenway Trail already has any existing activities (such as 'Hiking'). Since the goal is to add 'Biking' to this trail, and the trail likely already exists with 'Hiking', this condition will cause the migration to silently skip updating the trail.

We should update the activities to 'Biking, Hiking' unconditionally or check if 'Biking' is not already present.

UPDATE pois
SET primary_activities = 'Biking, Hiking'
WHERE name = 'Mud Brook Greenway Trail';

[gemini-code-assist]

The addition of || isFilteredMode to the includeLinearFeatures condition creates a tautology (!isFilteredMode || isFilteredMode), which makes includeLinearFeatures always evaluate to true. This completely bypasses the performance optimization intended to skip processing linear features when the map is filtered to a small set of specific point POIs.

Instead of unconditionally enabling linear features in filtered mode, we should only enable them if one of the active filters is an activity filter (i.e., has activity_fallbacks in iconConfig). This preserves the optimization while still showing trails when their activity filter is active.

Suggested change

	visibleTypes.has('boundary') ||
	isFilteredMode;
	visibleTypes.has('boundary') ||
	(iconConfig && Array.from(visibleTypes).some(type => iconConfig.find(icon => icon.name === type)?.activity_fallbacks));