Click your own name in the studio and you land in dev's repository list #207

In studio mode, /:owner now leads with that owner's apps, drawn by the same shelf component (shelfRows) the studio home's "Your apps" card uses — same state dot, live/not-running badge, happening line, and asks pill. "New app" is the primary action; an owner with no apps gets the studio's empty state (with the create action only for the owner themself). "New repository" stays reachable from the header, just demoted to a ghost button since the studio doesn't lead with it, and the repository list (with its filter) is untouched underneath. Visibility reuses listReposByOwner's existing access check, so a stranger never sees a private app. Dev mode's /:owner is unchanged.

Added a test in test/studio.test.ts covering: the studio shelf and "New app" action appearing for the owner, their absence in dev mode, and a stranger seeing the studio's empty state instead of a private app. bun test test/studio.test.ts passes (113/113), tsc --noEmit is clean, and the full forge.json check suite shows only pre-existing failures unrelated to this change (git-push-over-HTTP auth issues in this sandbox, reproduced identically without my diff applied).

Closes #185