Fix profile.html stylesheet link and add theme partial

[ionfwsrijan]

Problem

profile.html links a stylesheet named styles.css, but src/static only contains style.css. The profile page (the page users land on after GitHub login) loads with no application CSS and renders unstyled. It also omits the theme_head.html partial that every other page includes, so theme initialization is missing.

Fix

• Change the stylesheet link from styles.css to style.css.
• Add {% include 'partials/theme_head.html' %} in the head so profile.html gets the same theme initialization (data-theme attribute + dark-theme body class) as the rest of the site.

Files changed

• src/templates/profile.html

Testing

• profile.html now references style.css (exists at src/static/style.css); no styles.css reference remains.
• theme_head.html partial renders (initThemeInline script present in head).
• Full suite: 522 passed, 19 pre-existing unrelated failures, 3 skipped.

Closes #1860

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