Emit data-project-interest on project detail page

[ionfwsrijan]

Problem

The "Recently Viewed" panel always shows a meaningless "General" chip because script.js looks for the data-project-interest attribute to record a project's interest, but project.html never emits it. The attribute query falls back to the hardcoded string "General".

Fix

Add data-project-interest="{{ project.interest }}" to the tag of src/templates/project.html. script.js reads document.querySelector("[data-project-interest]"), so the body element (the earliest node in the page) now provides the real interest from the project metadata.

Files changed

• src/templates/project.html

Testing

• GET /project/1 renders data-project-interest="Data" on the body tag (matching the dataset interest).
• Recently-viewed tracking in script.js now records the actual interest instead of "General".
• Full suite: 522 passed, 19 pre-existing unrelated failures, 3 skipped.

Closes #1859

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