fix: polish instance picker, fix modal focus rings, and hide remote storage info

[MaanilVerma]

Summary

Polish pass on the launcher's instance picker and per-instance About tab, plus a focus-trap fix shared by every modal/takeover. Opening any dialog no longer flashes a focus ring, the picker list now animates when filtered, and the About tab stops showing local-storage rows for cloud/remote connections.

Changes

What

• BrandTakeoverLayout / BaseModal / BaseAlert / WhyTryCloudModal / MigrateConfirmTakeover: focus the role="dialog" container (tabindex="-1") on open instead of the first button, so opening via mouse/programmatic focus no longer paints a :focus-visible ring. Focus stays trapped for keyboard/AT users — they Tab from the container to reach controls.
• TrackModal / LoadSnapshotModal: on open, prefer a real input/select (lets the user type immediately), otherwise fall back to the dialog container — never a button. This fixes LoadSnapshotModal's "Browse" button getting the ring in its empty state.
• InstancePickerView: wrap the left instance list in a <TransitionGroup name="picker-row"> reusing ChooserView's tile motion (enter rise+fade 200ms, leave fade-out-of-flow 140ms, FLIP move 220ms iOS curve) so search/filter reflows smoothly. Added a lockLeavingRowSize FLIP hook and a prefers-reduced-motion fallback.
• StatusFactPanel: hide the "Location & storage" group when sourceCategory !== 'local' — cloud/remote connections have no local footprint (also covers the "no disk data" case, since diskUsage is null for them).
• StatusFactPanel: show the remote-URL edit pencil at rest (opacity: 0.6) instead of hover-only; dropped the redundant row-hover reveal rule.
• ProgressModal: replace the clipped stack ellipse scrim with a centered blurred circle behind the wordmark/bar/text.

Breaking

• None. No IPC channels, props, or stores changed signatures; the editable remote-URL row is unaffected (its remote.url = "URL" label lands under Instance details, not Location & storage).

Review Focus

• The dialog-container focus pattern is the crux — confirm focus is still trapped (ESC closes, Tab cycles within) on each modal, just without the on-open ring.
• StatusFactPanel gate: verify cloud/remote instances lose only the storage group and keep the editable URL row.
• Scope is launcher/picker + shared modal focus only. Other surfaces that focus a text input on open (ModalDialog, BaseSelect, BaseMenu, BaseActionSheet) were deliberately left unchanged — inputs don't exhibit the button-ring issue.

Testing

UI/visual changes with no logic-path impact, so verification is manual + the existing typecheck/lint gauntlet; no new unit tests (they'd only re-assert unchanged store/IPC behavior).

• pnpm typecheck (node/web/e2e/integration) — clean.
• pnpm lint — clean.
• Manual: open each modal/takeover → no focus ring on open, ring appears on first Tab. Filter the picker list → rows cross-fade and slide. About tab on a local vs cloud/remote instance → storage group present only for local; URL pencil visible at rest for remote.