Every "are you sure?" dialog confirms with Ctrl+Enter, gives each choice its own key, and ignores Enter #524

Context

Every "are you sure?" dialog lets Enter press whichever button has focus, so Tab-Enter or a mouse click followed by Enter can discard work, and every choice looks the same. This moves all seven confirms onto the library's ConfirmDialog, following the style guide's revised Dialog buttons rule: Ctrl+Enter presses the main action, every other choice has its own letter, Esc cancels, Enter does nothing. Pitch: #483.

mentaldesk/tui-style-guide#44 (an app without AppShell can run a ConfirmDialog) has shipped, and main already has MentalDesk.Tui 0.3.9 (#571), so no bump is needed here. #484's button schemes have already landed (#506).

Acceptance criteria

For each dialog below: open it, then check its buttons and keys match the row.

• Each dialog's buttons, keys and colours match its row: Primary in the accent colour, Danger in red, Cancel muted, each key shown first on its button.
• Cancel has focus when each dialog opens.
• Ctrl+Enter presses the main action, and each letter presses its own button without Alt, whichever button has focus.
• Enter does nothing, whichever button has focus, including after Tab or a mouse click onto Don't save, Overwrite, Reload, Delete or Revert.
• Esc cancels; Left/Right and Tab move between buttons; Space presses the focused one; clicking a button presses it.
• Each choice does what it did before (saves, discards, compares, overwrites, reloads, deletes, reverts, binds).
• Works in every bundled theme, and over SSH.

Tests

• Each confirm's buttons: title, key, kind and order.
• Ctrl+Enter, each letter, Esc, Space, and Enter with focus on every button, through the real key path, including the Windows Ctrl+LineFeed rewrite reaching Ctrl+Enter.
• The caller's outcome for each choice (save, discard, compare, overwrite, reload, delete, revert, bind, cancel).
• ConfirmView and KeybindingConflictDialog are gone, with nothing left calling them.

Out of scope

• Buttons outside confirms (Document Info, Open Folder, the review comment box, the terminal-integration picker, Settings' "Conflict" OK box).
• Delete to the Trash (Deleting a file in the explorer can't be taken back, even when git can't restore it #128). Whichever lands second updates the Delete dialog's wording.
• Making the dialog keys rebindable.
• Changing the library itself: anything ConfirmDialog lacks goes to tui-style-guide as its own issue.