feat: Add keyboard shortcuts and improved error messages (Phase 6)

Added user experience improvements:
- Keyboard shortcuts: ESC to cancel, ENTER to confirm
- Enhanced error messages with detailed descriptions
- Hohmann tab input validation
- Error message display in Hohmann tab
- Edge case handling for all input scenarios
- Clear error messages when tab switches

Keyboard shortcuts work for all dialog tabs and delete confirmation.

docs/planning/maneuver_dialog_progress.md

@@ -89,13 +89,6 @@ None currently
 
 ## Pending Tasks
 
-### Phase 5: Enhanced Maneuver List
-- [ ] Modify render_maneuver_list_ui() for selectable items
-- [ ] Add maneuver preview panel to list
-- [ ] Add action buttons (Create, Hohmann, Edit, Delete)
-- [ ] Connect buttons to dialog
-- [ ] Test enhanced list interaction
-
 ### Phase 6: Polish
 - [ ] Add keyboard shortcuts (Enter to confirm, Escape to cancel)
 - [ ] Improve error messages
@@ -122,26 +115,25 @@ None currently
 ### Phase 4
 9. `b0d9d99` - feat: Implement Edit Maneuver tab (Phase 4)
 
-## Next Steps
+### Phase 5
+10. `0af8ece` - feat: Enhance maneuver list (Phase 5)
 
-1. **Phase 5: Enhanced Maneuver List** - Improve list UI
-   - Make maneuvers selectable
-   - Add preview panel below list
-   - Add edit/delete buttons for selected maneuver
+## Next Steps
 
-2. **Phase 6: Polish** - User experience improvements
+1. **Phase 6: Polish** - User experience improvements
    - Keyboard shortcuts
    - Better error messages
    - Tooltips and help text
    - Edge case handling
+   - Testing with various configurations
 
 ## Progress Summary
 
 - **Total Tasks:** 35
-- **Completed:** 25 (Phase 1: 6, Phase 2: 7, Phase 3: 6, Phase 4: 6)
+- **Completed:** 30 (Phase 1: 6, Phase 2: 7, Phase 3: 6, Phase 4: 6, Phase 5: 5)
 - **In Progress:** 0
-- **Pending:** 10 (Phase 5: 5, Phase 6: 5)
-- **Completion:** 71.4%
+- **Pending:** 5 (Phase 6: 5)
+- **Completion:** 85.7%
 
 ## Implementation Notes
 
@@ -155,4 +147,8 @@ None currently
 - Proper initialization of current_body_index from spacecraft's parent
 - Edit tab with locked spacecraft field and full parameter editing
 - load_maneuver_into_dialog() loads existing maneuver data
-- Delete confirmation dialog overlay on edit tab
+- Delete confirmation dialog overlay on edit tab
+- Enhanced maneuver list with selectable items
+- Preview panel shows selected maneuver details and orbital preview
+- Action buttons for Create, Hohmann, Edit, Delete
+- selected_maneuver_index tracking in UIState

src/main.cpp

@@ -131,6 +131,46 @@ void run_gui_simulation(SimulationState* sim) {
             render_body_info_ui(sim, &render_state, &ui_state);
             render_maneuver_list_ui(sim, &render_state, &ui_state);
             render_maneuver_dialog(sim, &render_state, &ui_state);
+
+            // Handle keyboard shortcuts for maneuver dialog
+            if (ui_state.maneuver_dialog.open) {
+                if (IsKeyPressed(KEY_ESCAPE)) {
+                    if (ui_state.maneuver_dialog.show_delete_confirm) {
+                        ui_state.maneuver_dialog.show_delete_confirm = false;
+                    } else {
+                        ui_state.maneuver_dialog.open = false;
+                    }
+                }
+
+                if (IsKeyPressed(KEY_ENTER)) {
+                    if (ui_state.maneuver_dialog.show_delete_confirm) {
+                        // Confirm delete
+                        int edit_index = ui_state.maneuver_dialog.edit_maneuver_index;
+                        if (edit_index >= 0 && edit_index < sim->maneuver_count) {
+                            remove_maneuver_by_index(sim, edit_index);
+                            ui_state.maneuver_dialog.show_delete_confirm = false;
+                            ui_state.maneuver_dialog.open = false;
+                        }
+                    } else {
+                        // Confirm action based on tab
+                        switch (ui_state.maneuver_dialog.active_tab) {
+                            case MD_TAB_CREATE:
+                                create_maneuver_from_dialog(sim, &ui_state);
+                                break;
+                            case MD_TAB_HOHMANN:
+                                // Calculate button functionality - trigger calculation
+                                if (ui_state.maneuver_dialog.craft_index >= 0 &&
+                                    ui_state.maneuver_dialog.craft_index < sim->craft_count) {
+                                    calculate_hohmann_for_dialog(sim, &ui_state);
+                                }
+                                break;
+                            case MD_TAB_EDIT:
+                                update_maneuver_from_dialog(sim, &ui_state);
+                                break;
+                        }
+                    }
+                }
+            }
         end_frame();
     }
 

src/ui_renderer.cpp

@@ -693,6 +693,9 @@ void render_orbital_preview(SimulationState* sim, UIState* ui_state, Rectangle b
 void render_maneuver_hohmann_tab(SimulationState* sim, UIState* ui_state, int x, int y, int width, int height) {
     int current_y = y;
 
+    ui_state->maneuver_dialog.show_error = false;
+    ui_state->maneuver_dialog.error_message[0] = '\0';
+
     if (ui_state->maneuver_dialog.craft_index >= 0 &&
         ui_state->maneuver_dialog.craft_index < sim->craft_count) {
         Spacecraft* craft = &sim->spacecraft[ui_state->maneuver_dialog.craft_index];
@@ -802,6 +805,12 @@ void render_maneuver_hohmann_tab(SimulationState* sim, UIState* ui_state, int x,
     }
     current_y += 40;
 
+    if (ui_state->maneuver_dialog.show_error) {
+        Rectangle error_bounds = {(float)x + 8, (float)current_y, (float)width - 16, 25};
+        GuiLabel(error_bounds, TextFormat("Error: %s", ui_state->maneuver_dialog.error_message));
+        current_y += 30;
+    }
+
     if (ui_state->maneuver_dialog.show_hohmann_preview) {
         HohmannTransfer* ht = &ui_state->maneuver_dialog.last_calc;
 
@@ -865,30 +874,85 @@ void render_maneuver_hohmann_tab(SimulationState* sim, UIState* ui_state, int x,
 
 void calculate_hohmann_for_dialog(SimulationState* sim, UIState* ui_state) {
     ui_state->maneuver_dialog.show_hohmann_preview = false;
+    ui_state->maneuver_dialog.show_error = false;
+    ui_state->maneuver_dialog.error_message[0] = '\0';
+
+    if (ui_state->maneuver_dialog.craft_index < 0 ||
+        ui_state->maneuver_dialog.craft_index >= sim->craft_count) {
+        snprintf(ui_state->maneuver_dialog.error_message, sizeof(ui_state->maneuver_dialog.error_message),
+                "No spacecraft selected");
+        ui_state->maneuver_dialog.show_error = true;
+        return;
+    }
 
     if (ui_state->maneuver_dialog.transfer_body_index < 0 ||
-        ui_state->maneuver_dialog.transfer_body_index >= sim->body_count ||
-        ui_state->maneuver_dialog.target_body_index < 0 ||
+        ui_state->maneuver_dialog.transfer_body_index >= sim->body_count) {
+        snprintf(ui_state->maneuver_dialog.error_message, sizeof(ui_state->maneuver_dialog.error_message),
+                "Invalid transfer parent body selected");
+        ui_state->maneuver_dialog.show_error = true;
+        return;
+    }
+
+    if (ui_state->maneuver_dialog.current_body_index < 0 ||
+        ui_state->maneuver_dialog.current_body_index >= sim->body_count) {
+        snprintf(ui_state->maneuver_dialog.error_message, sizeof(ui_state->maneuver_dialog.error_message),
+                "Invalid current body selected");
+        ui_state->maneuver_dialog.show_error = true;
+        return;
+    }
+
+    if (ui_state->maneuver_dialog.target_body_index < 0 ||
         ui_state->maneuver_dialog.target_body_index >= sim->body_count) {
+        snprintf(ui_state->maneuver_dialog.error_message, sizeof(ui_state->maneuver_dialog.error_message),
+                "Invalid target body selected");
+        ui_state->maneuver_dialog.show_error = true;
         return;
     }
 
     if (ui_state->maneuver_dialog.transfer_body_index == ui_state->maneuver_dialog.target_body_index) {
+        snprintf(ui_state->maneuver_dialog.error_message, sizeof(ui_state->maneuver_dialog.error_message),
+                "Current and target bodies must be different");
+        ui_state->maneuver_dialog.show_error = true;
+        return;
+    }
+
+    Spacecraft* craft = &sim->spacecraft[ui_state->maneuver_dialog.craft_index];
+    if (craft->parent_index != ui_state->maneuver_dialog.current_body_index) {
+        snprintf(ui_state->maneuver_dialog.error_message, sizeof(ui_state->maneuver_dialog.error_message),
+                "Spacecraft is not orbiting the selected current body");
+        ui_state->maneuver_dialog.show_error = true;
         return;
     }
 
-    CelestialBody* central_body = &sim->bodies[ui_state->maneuver_dialog.transfer_body_index];
+    CelestialBody* transfer_body = &sim->bodies[ui_state->maneuver_dialog.transfer_body_index];
     CelestialBody* current_body = &sim->bodies[ui_state->maneuver_dialog.current_body_index];
     CelestialBody* target_body = &sim->bodies[ui_state->maneuver_dialog.target_body_index];
 
     double r1 = current_body->orbit.semi_major_axis;
     double r2 = target_body->orbit.semi_major_axis;
 
-    if (r1 <= 0 || r2 <= 0) {
+    if (r1 <= 0) {
+        snprintf(ui_state->maneuver_dialog.error_message, sizeof(ui_state->maneuver_dialog.error_message),
+                "Current body has invalid orbit (semi-major axis <= 0)");
+        ui_state->maneuver_dialog.show_error = true;
+        return;
+    }
+
+    if (r2 <= 0) {
+        snprintf(ui_state->maneuver_dialog.error_message, sizeof(ui_state->maneuver_dialog.error_message),
+                "Target body has invalid orbit (semi-major axis <= 0)");
+        ui_state->maneuver_dialog.show_error = true;
+        return;
+    }
+
+    if (transfer_body->mass <= 0) {
+        snprintf(ui_state->maneuver_dialog.error_message, sizeof(ui_state->maneuver_dialog.error_message),
+                "Transfer parent has invalid mass");
+        ui_state->maneuver_dialog.show_error = true;
         return;
     }
 
-    ui_state->maneuver_dialog.last_calc = calculate_hohmann_transfer(r1, r2, central_body->mass);
+    ui_state->maneuver_dialog.last_calc = calculate_hohmann_transfer(r1, r2, transfer_body->mass);
     ui_state->maneuver_dialog.show_hohmann_preview = true;
 }