Box selection, delete guard, new tabs and launches at the start place

[CodingDiego]

Four fixes reported while using rexplorer as the daily file manager.

• File list: click-and-drag does not box-select multiple items #5 Box selection: in Details view, a drag that starts on a row's other columns (Date, Type, Size) draws a selection rectangle, as in Explorer. A drag from a name still drags the item, and a click on any column still selects the row.
  • The press reaches the ListView with full-row select off, so the ListView treats it as blank space.
  • A short timer that fires inside the marquee loop turns full-row back on, so the rectangle takes whole rows.
  • A press released without a drag is replayed as a normal click.
• Delete on Home's cloud (OneDrive) recent files fails with 0x80004002 #3 Delete on Home's cloud files: Home's OneDrive recent files report neither SFGAO_CANDELETE nor SFGAO_FILESYSTEM, and the shell's delete verb failed on them with 0x80004002. Delete now beeps instead, and the command bar's Delete is disabled for such a selection.
  • Home's local recent files report only SFGAO_FILESYSTEM and still delete.
  • File system folders skip the check, so Ctrl+A in a huge folder stays cheap.
• New tab (Ctrl+T / +) opens the current folder instead of the start location #6 New tab: Ctrl+T and the tab strip's + open the start place instead of duplicating the current folder.
• A new launch reopens the last session's tabs instead of the start location #4 Launch: a plain launch opens the start place, as Explorer does. View and pane widths still come from the session, and --recover (crash restart) still restores the tabs.

Verification

• cargo build --release with -D warnings; cargo test --release passes (78 + 79) on a scratch %APPDATA%.
• Drove the release exe on a scratch %APPDATA% and a 30-file folder with synthetic mouse and keyboard input:
  • A drag from row 2's Date cell to row 6 selects rows 2–6.
  • A click on a Date cell selects that row.
  • A drag from a name drags the item.
  • Del recycles a file.
  • Ctrl+T opens Home.
  • A plain relaunch opens Home, and --recover restores the tabs.
• Not driven: single-click mode with a click on a Date cell.

Fixes #3
Fixes #4
Fixes #5
Fixes #6

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