Fixes #2172

Problem

Users had no discoverable way to delete a project from the Projects page. The 3-dot menu on project cards only showed "Settings", and the delete option was buried inside the Settings page under the "Danger Zone" tab.

Solution

Added a "Delete Project" menu item (styled in error/red color) to the project card 3-dot context menu. Clicking it opens a confirmation dialog before performing the deletion.

Changes

• Added DeleteForeverIcon, Dialog, DialogTitle, DialogContent, DialogContentText, DialogActions imports
• • Added useDeleteProject import from services
• • Added deleteConfirmOpen and projectToDelete state variables
• • Added handleDeleteProjectMenu handler: saves selected project, opens confirm dialog, closes context menu
• • Added handleConfirmDelete handler: calls deleteProjectMutation.mutateAsync, shows success/error snackbar, invalidates project list query
• • Added red-styled "Delete Project" MenuItem to the context menu (after Settings)
• • Added confirmation Dialog with title "Delete Project", body "Are you sure you want to delete {name}? This action cannot be undone.", and Cancel/Delete buttons

Testing

1. Open the Projects page
2. 2. Click the 3-dot menu on any project card
3. 3. Verify "Delete Project" appears below "Settings" in red
4. 4. Click "Delete Project" — confirm the dialog appears with the correct project name
5. 5. Click Delete — confirm the project is removed and a success snackbar appears
6. 6. Click Cancel — confirm the dialog closes and the project is not deleted