PE-9205: A drive's details beside Your Drives

[vilenarios]

Stacked on #2233. It builds on click-to-highlight, and targets that branch until #2233 merges.

A click on a drive in Your Drives now opens its details on the right, as a click on a row in a drive already does. A double-click still opens the drive, and clicking a drive still never syncs it.

What you see

	Synced drive	Never synced here
Drive ID, last updated, created, signature type	✓	✓
Size and contents	✓	"Never synced", a line saying why, and Sync Now
Share, rename, hide	✓	✓
Download	✓	Not offered, since none of its files are known
Close	X, or Escape	X, or Escape

Sync Now is an explicit press, doing what the drive's own menu does. Opening the details syncs nothing.

Room for it

The panel is the explorer's, at the explorer's width: a quarter of the window, never under 375px.

• Pushes the list while the list can keep its rows as rows. Beside the panel the list may drop to three columns (name, last synced, size). The two it drops, files and created, are what the panel shows.
• Covers the right of the list where even three columns won't fit. Pushing there would turn rows into cards, which are taller, so every row would move under the pointer between the two clicks of a double-click.

Window	Result
1920	Pushes, all five columns stay
1440, 1280	Pushes, three columns
1200, 1100	Covers

The list stays at one place in the widget tree in every case, so opening the panel never rebuilds a row, and a double-click survives it.

Fixed on the way, in the explorer too

• More Info on a never-synced drive spun forever. The Details tab asked for the root folder's revision with getSingle, which threw inside a stream listener where no onError hears it. It now shows what is known, and a load that fails ends on a message instead of a spinner.
• The explorer's panel for an unsynced drive had no close button. Its toolbar only drew for a loaded drive. It now closes, and offers Sync Now.
• The toolbar can't act on the wrong drive. It used to read the explorer's state. Your Drives keeps that state alive holding the last drive you opened, so a panel beside the list would have offered to share and rename the wrong drive. It now takes the drive it's given.

Testing

• 17 new tests. The info cubit and the panel run against a real in-memory database. The list is tested beside the panel. The push-or-cover decision is tested at the five widths above.
• Eight mutations, each breaking one rule, are each caught by a failing assertion, not a compile error.
• The full suite is 2,204 passing, and flutter analyze is clean.

Please check on the preview

1. Your Drives: click a drive. Its details slide in on the right, and the row highlights. Click another drive and the panel switches. Press Escape or click the X: it closes, and the highlight goes.
2. A never-synced drive: "Never synced" appears where the size goes, with Sync Now. Nothing syncs until you press it.
3. At a laptop width, the list keeps three columns beside the panel. Narrow the window and the panel covers the list instead.
4. Double-click a drive: it opens, panel or not.
5. In a drive, ⋯ → More Info on a never-synced drive: details and a close button, not a spinner.

🤖 Generated with Claude Code

https://claude.ai/code/session_01ShVJiUhdRWk35ZWbP3sZyN

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Visit the preview URL for this PR (updated for commit 847cad5):

https://ardrive-web--pr2234-drive-info-panel-efint1xw.web.app

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