Add Autocomplete and Fastest Route Calculation to Mapping System

[austinkden]

I have implemented a comprehensive routing and mapping system. Key features include:

1. Autocomplete Inputs: Search, Starting, and Destination fields now suggest locations (intersections and buildings) as users type.
2. Fastest Route Calculation: A Dijkstra-based routing engine calculates the fastest path by factoring in both distance and road speed limits.
3. Visual Feedback: The map draws a polyline for the route and places distinct 'Start' and 'Destination' markers using Lucide icons.
4. Step-by-Step Directions: A new 'Directions' sidebar section provides total distance, estimated travel time, and turn-by-turn instructions.
5. Connectivity Fixes: Updated mapping.json to connect key points of interest (like the DMV and Liberty Cafe) to the main road network, enabling functional routing to/from these locations.
6. Performance Improvements: Pathfinding is optimized using a pre-generated adjacency list to ensure near-instant calculations.

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PR created automatically by Jules for task 7389928096920589567 started by @austinkden

[google-labs-jules]

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[austinkden]

@google-labs-jules it looks like the X button on the directions dropdown doesn't work... clicking it just toggles the dropdown. Also, remove the estimated time

Also, adjust the way the mapping finds the nearest intersection to start/end the route. Choose the intersection that is closest to the starting point WITHOUT going in the opposite direction of the rest of travel (from the 2 closest intersections, choose the one that gives an overall shortest distance for the whole route)

[austinkden]

@jules it looks like the X button on the directions dropdown doesn't work... clicking it just toggles the dropdown. Also, remove the estimated time

Also, adjust the way the mapping finds the nearest intersection to start/end the route. Choose the intersection that is closest to the starting point WITHOUT going in the opposite direction of the rest of travel (from the 2 closest intersections, choose the one that gives an overall shortest distance for the whole route)

[austinkden]

@jules also make sure that you can scroll in the sidebar if the content takes up more than the entire thing (right now, i have expanded each of the dropdowns, and it goes beyond the screen, but i can't scroll)

[google-labs-jules]

@jules it looks like the X button on the directions dropdown doesn't work... clicking it just toggles the dropdown. Also, remove the estimated time

Also, adjust the way the mapping finds the nearest intersection to start/end the route. Choose the intersection that is closest to the starting point WITHOUT going in the opposite direction of the rest of travel (from the 2 closest intersections, choose the one that gives an overall shortest distance for the whole route)

I've fixed the X button behavior (using event delegation and stopping propagation) and removed the Estimated Time as requested. Also, I've updated the routing engine with a 'Smart Intersection' selection: for building points, it now dynamically evaluates the 2 closest intersections and picks the one that results in the shortest overall route. I've also added the necessary edges to the mapping data to support this.