Grouped list: clearer levels, release tags and a compact progress ring

[anciltech]

Summary

Polish for the grouped Xcode list, one commit each:

1. Shorter titles. Only the top level says "Xcode": Xcode 27 › 27.0 › 27.0 Beta 6. Rows under a group move the build number to the caption line next to the install path. The flat list is unchanged.

2. Distinct levels. Minor rows and their versions were indented by the same amount (leaf rows have no chevron). Each level is now one step further in, connected by tree guides (├ └ │), tinted along the branch that contains the active Xcode. Group rows show a count badge. Icons stay 32pt, as in d905ae7.

3. Release tags. Tinted capsules: orange for betas ("Beta 6"), purple for release candidates ("RC"), green "Latest" for the newest stable release. Group rows repeat them: the major version holding the newest release is tagged Latest, and a prerelease-only minor version shows its newest seed.

4. Progress once, as a ring. While installing, the major group, minor group and version row each showed a spinner with truncated "Step 2 of 7: Downloading..." text. Only the deepest visible row shows progress now, as an App Store style ring (determinate while downloading, spinning for other steps) with a stop button in the middle. Step, percentage and download details are in the tooltip; the info pane keeps the full detail.

5. Build number out of titles. "27.2 Beta 2 (27B5028f)" becomes "27.2 Beta 2"; the build moves to the row caption next to the install path and to a secondary line under the info pane title.

6. Green checkmarks for installed Xcodes. The "make active" checkmark on installed rows was grey; it is now a green outline, and the active Xcode keeps the filled green check.

7. Contrast and fewer icons. Only major version rows show the Xcode icon; not-installed icons go from 20% to 50% opacity; group rows show the tag before the count.

8. Ring aligned with the buttons. The install control gets a column as wide as the Install/Open buttons, so the ring is centered under them.

9. Active tag. The active Xcode gets a blue "Active" tag; while it is inside a collapsed group, the deepest visible group row carries the tag, and groups containing it say so in the subtitle: "Latest: 27.0 · Active: 27.0 Beta 6".

10. Softer selection. The sidebar's system highlight can't be restyled and made tags and secondary text hard to read, in and out of focus. Rows draw their own highlight (accent color at 20% opacity) with regular text; tags keep their colors and buttons their normal style. Arrow keys still move the selection through the visible versions.

11. Guides meet the title. Tree guide branches end at the row's title line instead of the middle of two-line rows.

12. One checkmark per branch. Group rows show the active/select checkmark only while collapsed.

13. Chevrons on the title line. Nested group rows align the chevron with the title, where the tree guide branch ends, instead of centering it on the two-line row.

14. One Open/Install per branch. Expanded groups no longer repeat their latest release's Open/Install button (a branch could show three OPEN buttons for the same Xcode); like the checkmark and progress ring, it stays on the deepest visible row.

15. Titles never truncate. With several tags plus the identical-builds and Apple silicon symbols, a version row's title could be squeezed to "2…". The title keeps its full width and the small symbols are dropped first.

New strings: Tag.Latest, Tag.Active (English only for now).

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