Update the tileserver URL scheme

[inan-hira]

As discussed in #31, this change updates the OSM Tile Server URL scheme to us the recommended string.

Summary by Sourcery

Enhancements:

• Switch the map tile source from the legacy OSM URL pattern to the current recommended openstreetmap.org HTTPS endpoint.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the Leaflet OSM tile layer to use the current recommended HTTPS OpenStreetMap tile URL pattern.

File-Level Changes

Change	Details	Files
Switch the Leaflet tile layer to the new HTTPS OpenStreetMap tiles URL scheme.	Replace deprecated http://{s}.tile.osm.org URL with https://tile.openstreetmap.org Remove the subdomain placeholder {s} from the tile URL template while keeping zoom/x/y placeholders intact	js/main.js

Possibly linked issues

• Use the recommended OSM Tile Server URL scheme #31: PR exactly updates the Leaflet tiles URL to the new recommended OSM scheme requested in the issue.

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[sourcery-ai]

Hey - I've left some high level feedback:

• Since you’re updating the tile URL to HTTPS, consider also updating the attribution link to use https://osm.org/copyright for consistency and to avoid mixed-content issues in strict environments.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since you’re updating the tile URL to HTTPS, consider also updating the attribution link to use `https://osm.org/copyright` for consistency and to avoid mixed-content issues in strict environments.

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