The actualCost TextField and the notes TextEditor each had their own
`.keyboardDismissToolbar()` modifier, which installs a separate
`ToolbarItemGroup(placement: .keyboard)`. SwiftUI accumulates these
on the responder chain, so focusing any field rendered two "Done"
buttons stacked above the keyboard (issue screenshot in gitea#5).
Move the modifier up to the Form root so exactly one keyboard
toolbar is registered for the entire screen, matching the pattern
already used by `TaskFormView`.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Trey T