Fix missing Mapbox preview and route URL on duplicate GPX upload

[Copilot]

Duplicate GPX uploads via "Use Existing File" never rendered the map preview or route URL because fetchExistingFileContent omitted displayPoints from the onFileParsed callback in the two primary code paths.

• Added displayPoints to DuplicateFile interface and read it from the Firestore document in checkForDuplicate
• Pass displayPoints through onFileParsed in Method 1 (Firestore content cache) and Method 2 (Storage reference fetch), with a processGPXUpload() fallback for Method 2 if cached points are missing

The fresh upload path already passed all required args correctly — only the duplicate resolution paths were affected:

// Before (Methods 1 & 2): missing 5th arg → uploadedRoutePoints stays empty → no map
onFileParsed(content, filename, fileUrl, duplicateFound.docId || null);

// After: displayPoints flows through → map renders
onFileParsed(content, filename, fileUrl, duplicateFound.docId || null, duplicateFound.displayPoints);

Original prompt

---

This section details on the original issue you should resolve

<issue_title>gpx upload on duplicate, no mapbox review, no route url.</issue_title>
<issue_description>probably a condition that's not rendering, but normal path working as expected. backlog for now.</issue_description>

<agent_instructions>fix it.
</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@aleexwong gpx upload file selector still present, but that is expected after code refactored/ mods to just to the happy path.

• Fixes gpx upload on duplicate, no mapbox review, no route url. #4

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