fix portable rename + route external links through xdg-open scrubber

Issue #70: rename button was disabled for portable instances; the upstream
restriction assumed portable = MO2-binary dir, which doesn't apply here
(binary lives in ~/.local/share/fluorine/bin, instance dir is separate).
Allow rename when not active, and update the portable registry so the
renamed dir keeps showing up.

Issue #67: QLabel::setOpenExternalLinks(true) and friends route through
QDesktopServices::openUrl, which forks xdg-open with our bundled Qt env
inherited — silently fails. Install a global url handler that defers to
shell::Open, which already scrubs LD_LIBRARY_PATH/QT_PLUGIN_PATH.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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