Clicking a file name in the File Activity card now opens the file's preview
tab in the right Sidebar — the shipped document-preview viewer, reached the
same way the built-in Files sidebar reaches it — on harnesses that serve that
column (dsh 0.1.5-rc.1+). The address is built with the harness's own
browser-safe `fileAddressFor`, inlined by the client bundle exactly as the
Sidebar's file types inline it, so a path under the workspace collapses to the
session-relative spelling and every route to one file settles on one tab.
The capability is OPTIONAL by contract, like the tab registration itself: the
opener reads `ctx.sidebarRight.openResource` through the runtime boundary and
re-proves it per call, and reports whether the column took the address. An
absent column, a face that refuses the address, or an unencodable log path
falls through to the pre-existing system-open behavior, so an older line is
fully functional and nothing becomes an inert click. Pattern rows and
directory targets are never previewable.
Adds the `@deepseek-ai/dsh-util-workspace-path` dev dependency (itself
browser-safe), allows it in the client bundle purity gate, pins the
resource-navigation seam in the compat matrix, and covers the address builder,
the card's preview-then-fallback click, and the optional opener per baseline.
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