refactor: one Theme.qml in shared/, symlinked from each component

The four copies had already drifted, which is the argument for doing this
now rather than when a palette change has to be made four times and lands
in three of them. vm-manager was missing surfaceAlt; volume-osd was missing
green, yellow and surfaceAlt. The shared file is the superset, so the two
thin ones gain properties they never had and nothing loses one.

A symlink rather than a shared import path: a singleton outside the config
directory needs a qmldir beside it, the same friction that already keeps
the generated palette parsed rather than imported. Quickshell follows the
link and resolves the singleton with no qmldir, so no consumer changes and
no component stops running standalone under qs -p.

All four load clean with Configuration Loaded and no QML resolution error.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TvHeJEXJzdfAaCCYqURAWp

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