Elevation profile enhancement (#1394)

* feat: enhance elevation profile with download options for SVG and PNG formats

Co-authored-by: Copilot <copilot@github.com>

* refactor: improve elevation profile code readability and performance

Co-authored-by: Copilot <copilot@github.com>

* fix: swap default selection for elevation profile interpolation options

Co-authored-by: Copilot <copilot@github.com>

* Refactor elevation profile functionality into a dedicated controller

- Migrate elevation profile logic from `elevation-profile.js` to `elevation-profile.ts`.
- Update references in `rivers-editor.js` and `routes-editor.js` to use the new `ElevationProfile.open` method.
- Remove the old elevation profile script from `index.html`.
- Add necessary imports and type declarations in `global.ts` for new elevation profile functions.
- Ensure proper handling of elevation profile data and rendering in the new controller.

Co-authored-by: Copilot <copilot@github.com>

* fix: remove redundant cell information from population string in elevation profile

Co-authored-by: Copilot <copilot@github.com>

* refactor: improve code formatting and readability in elevation profile controller

* refactor: remove unnecessary blank line in index file

* refactor: remove unused axis calls in elevation profile grid rendering

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Co-authored-by: Copilot <copilot@github.com>

Author: Azgaar