Add delete functionality for projects and sessions

- Add delete buttons (🗑️) next to project/session dropdowns
- Add confirmation dialogs before deletion
- Add onDeleteProject and onDeleteSession props to Header
- Implement delete handlers in App.tsx with error handling
- Clear selection and related state after deletion
- Add CSS styling for delete button with hover effect

1 files changed, 12 insertions, 0 deletions

diff --git a/renderer/src/styles/globals.css b/renderer/src/styles/globals.css
index 809ff15..e1d945a 100644
--- a/renderer/src/styles/globals.css
+++ b/renderer/src/styles/globals.css
@@ -65,6 +65,18 @@ body {
   background: var(--border);
 }
 
+.header button.btn-delete {
+  background: transparent;
+  border: 1px solid var(--border);
+  padding: 6px 8px;
+  font-size: 14px;
+}
+
+.header button.btn-delete:hover {
+  background: var(--danger);
+  border-color: var(--danger);
+}
+
 .phase-indicator {
   display: flex;
   gap: 4px;