@mytec: iteration3 done for testing

frontend/src/App.tsx

@@ -11,6 +11,8 @@ import Heatmap from '@/components/map/Heatmap.tsx';
 import Legend from '@/components/map/Legend.tsx';
 import SiteList from '@/components/panels/SiteList.tsx';
 import SiteForm from '@/components/panels/SiteForm.tsx';
+import ExportPanel from '@/components/panels/ExportPanel.tsx';
+import ProjectPanel from '@/components/panels/ProjectPanel.tsx';
 import ToastContainer from '@/components/ui/Toast.tsx';
 import ThemeToggle from '@/components/ui/ThemeToggle.tsx';
 import Button from '@/components/ui/Button.tsx';
@@ -248,6 +250,7 @@ export default function App() {
               <Heatmap
                 points={coverageResult.points}
                 visible={heatmapVisible}
+                opacity={settings.heatmapOpacity}
               />
             )}
           </MapView>
@@ -349,9 +352,35 @@ export default function App() {
                     className="w-full h-1.5 bg-gray-200 dark:bg-dark-border rounded-lg appearance-none cursor-pointer accent-blue-600"
                   />
                 </div>
+                <div>
+                  <label className="text-xs text-gray-500 dark:text-dark-muted">
+                    Heatmap Opacity: {Math.round(settings.heatmapOpacity * 100)}%
+                  </label>
+                  <input
+                    type="range"
+                    min={0.3}
+                    max={1.0}
+                    step={0.1}
+                    value={settings.heatmapOpacity}
+                    onChange={(e) =>
+                      useCoverageStore
+                        .getState()
+                        .updateSettings({
+                          heatmapOpacity: Number(e.target.value),
+                        })
+                    }
+                    className="w-full h-1.5 bg-gray-200 dark:bg-dark-border rounded-lg appearance-none cursor-pointer accent-blue-600"
+                  />
                 </div>
               </div>
             </div>
+
+            {/* Export coverage data */}
+            <ExportPanel />
+
+            {/* Projects save/load */}
+            <ProjectPanel />
+          </div>
         </div>
       </div>
 

frontend/src/components/map/Heatmap.tsx

@@ -15,6 +15,7 @@ declare module 'leaflet' {
 interface HeatmapProps {
   points: CoveragePoint[];
   visible: boolean;
+  opacity?: number;
 }
 
 /**
@@ -52,7 +53,7 @@ function getHeatmapParams(zoom: number) {
   };
 }
 
-export default function Heatmap({ points, visible }: HeatmapProps) {
+export default function Heatmap({ points, visible, opacity = 0.7 }: HeatmapProps) {
   const map = useMap();
   const [mapZoom, setMapZoom] = useState(map.getZoom());
 
@@ -98,10 +99,16 @@ export default function Heatmap({ points, visible }: HeatmapProps) {
 
     heatLayer.addTo(map);
 
+    // Apply opacity to the canvas element
+    const container = (heatLayer as unknown as { _canvas?: HTMLCanvasElement })._canvas;
+    if (container) {
+      container.style.opacity = String(opacity);
+    }
+
     return () => {
       map.removeLayer(heatLayer);
     };
-  }, [map, points, visible, mapZoom]);
+  }, [map, points, visible, mapZoom, opacity]);
 
   return null;
 }

frontend/src/components/panels/ExportPanel.tsx

@@ -0,0 +1,92 @@
+import { useCoverageStore } from '@/store/coverage.ts';
+import { useToastStore } from '@/components/ui/Toast.tsx';
+import Button from '@/components/ui/Button.tsx';
+
+export default function ExportPanel() {
+  const result = useCoverageStore((s) => s.result);
+  const addToast = useToastStore((s) => s.addToast);
+
+  const points = result?.points ?? [];
+
+  const downloadBlob = (blob: Blob, filename: string) => {
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = filename;
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    URL.revokeObjectURL(url);
+  };
+
+  const exportCSV = () => {
+    if (points.length === 0) {
+      addToast('No coverage data to export. Run a calculation first.', 'error');
+      return;
+    }
+
+    const csv = [
+      'lat,lon,rsrp,site_id',
+      ...points.map((p) => `${p.lat},${p.lon},${p.rsrp},${p.siteId}`),
+    ].join('\n');
+
+    const blob = new Blob([csv], { type: 'text/csv;charset=utf-8' });
+    downloadBlob(blob, `rfcp-coverage-${Date.now()}.csv`);
+    addToast(`Exported ${points.length.toLocaleString()} points as CSV`, 'success');
+  };
+
+  const exportGeoJSON = () => {
+    if (points.length === 0) {
+      addToast('No coverage data to export. Run a calculation first.', 'error');
+      return;
+    }
+
+    const geojson = {
+      type: 'FeatureCollection' as const,
+      features: points.map((p) => ({
+        type: 'Feature' as const,
+        geometry: {
+          type: 'Point' as const,
+          coordinates: [p.lon, p.lat],
+        },
+        properties: {
+          rsrp: p.rsrp,
+          siteId: p.siteId,
+        },
+      })),
+    };
+
+    const blob = new Blob([JSON.stringify(geojson, null, 2)], {
+      type: 'application/geo+json;charset=utf-8',
+    });
+    downloadBlob(blob, `rfcp-coverage-${Date.now()}.geojson`);
+    addToast(`Exported ${points.length.toLocaleString()} points as GeoJSON`, 'success');
+  };
+
+  return (
+    <div className="bg-white dark:bg-dark-surface border border-gray-200 dark:border-dark-border rounded-lg shadow-sm p-4 space-y-3">
+      <h3 className="text-sm font-semibold text-gray-800 dark:text-dark-text">
+        Export Coverage
+      </h3>
+      {points.length > 0 ? (
+        <>
+          <p className="text-xs text-gray-500 dark:text-dark-muted">
+            {points.length.toLocaleString()} coverage points available
+          </p>
+          <div className="flex gap-2">
+            <Button onClick={exportCSV} size="sm" variant="secondary">
+              CSV
+            </Button>
+            <Button onClick={exportGeoJSON} size="sm" variant="secondary">
+              GeoJSON
+            </Button>
+          </div>
+        </>
+      ) : (
+        <p className="text-xs text-gray-400 dark:text-dark-muted">
+          No coverage data. Calculate coverage first to enable export.
+        </p>
+      )}
+    </div>
+  );
+}

frontend/src/components/panels/ProjectPanel.tsx

@@ -0,0 +1,165 @@
+import { useEffect, useState } from 'react';
+import { useProjectsStore } from '@/store/projects.ts';
+import { useToastStore } from '@/components/ui/Toast.tsx';
+import Button from '@/components/ui/Button.tsx';
+
+export default function ProjectPanel() {
+  const projects = useProjectsStore((s) => s.projects);
+  const currentProjectId = useProjectsStore((s) => s.currentProjectId);
+  const loadProjects = useProjectsStore((s) => s.loadProjects);
+  const saveProject = useProjectsStore((s) => s.saveProject);
+  const loadProject = useProjectsStore((s) => s.loadProject);
+  const deleteProject = useProjectsStore((s) => s.deleteProject);
+  const addToast = useToastStore((s) => s.addToast);
+
+  const [projectName, setProjectName] = useState('');
+  const [showSaveForm, setShowSaveForm] = useState(false);
+  const [isLoading, setIsLoading] = useState(false);
+
+  useEffect(() => {
+    loadProjects();
+  }, [loadProjects]);
+
+  const handleSave = async () => {
+    const name = projectName.trim();
+    if (!name) {
+      addToast('Please enter a project name', 'error');
+      return;
+    }
+
+    try {
+      await saveProject(name);
+      addToast(`Project "${name}" saved`, 'success');
+      setProjectName('');
+      setShowSaveForm(false);
+    } catch (err) {
+      console.error('Save project error:', err);
+      addToast('Failed to save project', 'error');
+    }
+  };
+
+  const handleLoad = async (id: string, name: string) => {
+    setIsLoading(true);
+    try {
+      const project = await loadProject(id);
+      if (project) {
+        addToast(`Loaded project "${name}" (${project.sites.length} sites)`, 'success');
+      } else {
+        addToast('Project not found', 'error');
+      }
+    } catch (err) {
+      console.error('Load project error:', err);
+      addToast('Failed to load project', 'error');
+    } finally {
+      setIsLoading(false);
+    }
+  };
+
+  const handleDelete = async (id: string, name: string) => {
+    try {
+      await deleteProject(id);
+      addToast(`Project "${name}" deleted`, 'info');
+    } catch (err) {
+      console.error('Delete project error:', err);
+      addToast('Failed to delete project', 'error');
+    }
+  };
+
+  const formatDate = (timestamp: number) => {
+    return new Date(timestamp).toLocaleDateString(undefined, {
+      month: 'short',
+      day: 'numeric',
+      hour: '2-digit',
+      minute: '2-digit',
+    });
+  };
+
+  return (
+    <div className="bg-white dark:bg-dark-surface border border-gray-200 dark:border-dark-border rounded-lg shadow-sm p-4 space-y-3">
+      <div className="flex items-center justify-between">
+        <h3 className="text-sm font-semibold text-gray-800 dark:text-dark-text">
+          Projects
+        </h3>
+        <Button
+          size="sm"
+          variant={showSaveForm ? 'secondary' : 'primary'}
+          onClick={() => setShowSaveForm(!showSaveForm)}
+        >
+          {showSaveForm ? 'Cancel' : 'Save Current'}
+        </Button>
+      </div>
+
+      {/* Save form */}
+      {showSaveForm && (
+        <div className="space-y-2">
+          <input
+            type="text"
+            value={projectName}
+            onChange={(e) => setProjectName(e.target.value)}
+            onKeyDown={(e) => e.key === 'Enter' && handleSave()}
+            placeholder="Project name"
+            className="w-full px-3 py-1.5 border border-gray-300 dark:border-dark-border dark:bg-dark-bg dark:text-dark-text rounded-md text-sm
+              focus:outline-none focus:ring-2 focus:ring-blue-500"
+            autoFocus
+          />
+          <Button size="sm" onClick={handleSave} disabled={!projectName.trim()}>
+            Save Project
+          </Button>
+        </div>
+      )}
+
+      {/* Projects list */}
+      {projects.length === 0 ? (
+        <p className="text-xs text-gray-400 dark:text-dark-muted">
+          No saved projects yet.
+        </p>
+      ) : (
+        <div className="space-y-1.5 max-h-48 overflow-y-auto">
+          {projects.map((project) => (
+            <div
+              key={project.id}
+              className={`flex items-center justify-between gap-2 px-2.5 py-2 rounded-md transition-colors
+                ${
+                  currentProjectId === project.id
+                    ? 'bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800'
+                    : 'bg-gray-50 dark:bg-dark-border/30 hover:bg-gray-100 dark:hover:bg-dark-border/50'
+                }`}
+            >
+              <div className="flex-1 min-w-0">
+                <div className="text-sm font-medium text-gray-800 dark:text-dark-text truncate">
+                  {project.name}
+                  {currentProjectId === project.id && (
+                    <span className="ml-1.5 text-xs text-blue-500 dark:text-blue-400">
+                      (active)
+                    </span>
+                  )}
+                </div>
+                <div className="text-xs text-gray-500 dark:text-dark-muted">
+                  {project.sites.length} site{project.sites.length !== 1 ? 's' : ''} &middot;{' '}
+                  {formatDate(project.updatedAt)}
+                </div>
+              </div>
+              <div className="flex gap-1 flex-shrink-0">
+                <button
+                  onClick={() => handleLoad(project.id, project.name)}
+                  disabled={isLoading}
+                  className="px-2 py-1 text-xs text-blue-600 dark:text-blue-400 hover:bg-blue-50 dark:hover:bg-blue-900/20 rounded
+                    min-w-[40px] min-h-[32px] flex items-center justify-center disabled:opacity-50"
+                >
+                  Load
+                </button>
+                <button
+                  onClick={() => handleDelete(project.id, project.name)}
+                  className="px-2 py-1 text-xs text-red-600 dark:text-red-400 hover:bg-red-50 dark:hover:bg-red-900/20 rounded
+                    min-w-[32px] min-h-[32px] flex items-center justify-center"
+                >
+                  &times;
+                </button>
+              </div>
+            </div>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}

frontend/src/services/terrain.ts

@@ -0,0 +1,89 @@
+/**
+ * Terrain Service – Phase 4 stub.
+ *
+ * Provides elevation queries that future phases will use for:
+ *  - Line-of-sight (LOS) / non-LOS classification
+ *  - Diffraction loss (knife-edge / Bullington)
+ *  - Terrain-aware heatmaps
+ *
+ * For now we expose the interface and a flat-terrain mock.
+ * Switch to BackendTerrainService once the FastAPI `/api/terrain/*`
+ * endpoints are ready with real SRTM / DEM data.
+ */
+
+export interface TerrainService {
+  /** Return ground elevation (metres above sea level) at a point. */
+  getElevation(lat: number, lon: number): Promise<number>;
+
+  /**
+   * Return an elevation profile between two points.
+   * @param samples  Number of equidistant samples along the path.
+   * @returns        Array of elevations (metres) from start to end.
+   */
+  getElevationProfile(
+    lat1: number,
+    lon1: number,
+    lat2: number,
+    lon2: number,
+    samples: number,
+  ): Promise<number[]>;
+}
+
+// ---------------------------------------------------------------------------
+// Mock – flat terrain (elevation 0 everywhere)
+// ---------------------------------------------------------------------------
+export class MockTerrainService implements TerrainService {
+  async getElevation(_lat: number, _lon: number): Promise<number> {
+    return 0;
+  }
+
+  async getElevationProfile(
+    _lat1: number,
+    _lon1: number,
+    _lat2: number,
+    _lon2: number,
+    samples: number,
+  ): Promise<number[]> {
+    return Array(samples).fill(0);
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Backend – calls FastAPI terrain endpoints (Phase 4+)
+// ---------------------------------------------------------------------------
+export class BackendTerrainService implements TerrainService {
+  private apiUrl: string;
+
+  constructor(apiUrl: string) {
+    this.apiUrl = apiUrl;
+  }
+
+  async getElevation(lat: number, lon: number): Promise<number> {
+    const response = await fetch(
+      `${this.apiUrl}/api/terrain/elevation?lat=${lat}&lon=${lon}`,
+    );
+    if (!response.ok) throw new Error(`Terrain API error: ${response.status}`);
+    const data = await response.json();
+    return data.elevation;
+  }
+
+  async getElevationProfile(
+    lat1: number,
+    lon1: number,
+    lat2: number,
+    lon2: number,
+    samples: number,
+  ): Promise<number[]> {
+    const response = await fetch(
+      `${this.apiUrl}/api/terrain/profile?lat1=${lat1}&lon1=${lon1}&lat2=${lat2}&lon2=${lon2}&samples=${samples}`,
+    );
+    if (!response.ok) throw new Error(`Terrain API error: ${response.status}`);
+    const data = await response.json();
+    return data.profile;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Default export – use Mock until backend is ready
+// ---------------------------------------------------------------------------
+export const terrainService: TerrainService = new MockTerrainService();

frontend/src/store/coverage.ts

@@ -21,6 +21,7 @@ export const useCoverageStore = create<CoverageState>((set) => ({
     radius: 10,
     resolution: 200,
     rsrpThreshold: -120,
+    heatmapOpacity: 0.7,
   },
   heatmapVisible: true,
 

frontend/src/store/projects.ts

@@ -0,0 +1,112 @@
+import { create } from 'zustand';
+import { v4 as uuidv4 } from 'uuid';
+import { db } from '@/db/schema.ts';
+import { useSitesStore } from '@/store/sites.ts';
+import { useCoverageStore } from '@/store/coverage.ts';
+import type { Site, CoverageSettings } from '@/types/index.ts';
+
+export interface Project {
+  id: string;
+  name: string;
+  description?: string;
+  sites: Site[];
+  coverageSettings: CoverageSettings;
+  createdAt: number;
+  updatedAt: number;
+}
+
+interface ProjectsState {
+  projects: Project[];
+  currentProjectId: string | null;
+
+  loadProjects: () => Promise<void>;
+  saveProject: (name: string, description?: string) => Promise<void>;
+  loadProject: (id: string) => Promise<Project | null>;
+  deleteProject: (id: string) => Promise<void>;
+}
+
+export const useProjectsStore = create<ProjectsState>((set, get) => ({
+  projects: [],
+  currentProjectId: null,
+
+  loadProjects: async () => {
+    const dbProjects = await db.projects.orderBy('updatedAt').reverse().toArray();
+    const projects: Project[] = dbProjects.map((p) => JSON.parse(p.data));
+    set({ projects });
+  },
+
+  saveProject: async (name: string, description?: string) => {
+    const sites = useSitesStore.getState().sites;
+    const coverageSettings = useCoverageStore.getState().settings;
+    const now = Date.now();
+
+    // Check if updating existing project with same name
+    const existing = get().projects.find((p) => p.name === name);
+    const id = existing?.id ?? uuidv4();
+
+    const project: Project = {
+      id,
+      name,
+      description,
+      sites,
+      coverageSettings,
+      createdAt: existing?.createdAt ?? now,
+      updatedAt: now,
+    };
+
+    await db.projects.put({
+      id,
+      name,
+      data: JSON.stringify(project),
+      createdAt: project.createdAt,
+      updatedAt: now,
+    });
+
+    set({ currentProjectId: id });
+    await get().loadProjects();
+  },
+
+  loadProject: async (id: string) => {
+    const dbProject = await db.projects.get(id);
+    if (!dbProject) return null;
+
+    const project: Project = JSON.parse(dbProject.data);
+
+    // Restore sites: clear existing and add project sites
+    const sitesStore = useSitesStore.getState();
+    // Clear all existing sites from DB
+    const currentSites = sitesStore.sites;
+    for (const site of currentSites) {
+      await sitesStore.deleteSite(site.id);
+    }
+
+    // Re-add project sites
+    for (const site of project.sites) {
+      await db.sites.put({
+        id: site.id,
+        data: JSON.stringify(site),
+        createdAt: new Date(site.createdAt).getTime(),
+        updatedAt: new Date(site.updatedAt).getTime(),
+      });
+    }
+    await sitesStore.loadSites();
+
+    // Restore coverage settings
+    useCoverageStore.getState().updateSettings(project.coverageSettings);
+
+    // Clear any existing coverage result (outdated for loaded project)
+    useCoverageStore.getState().setResult(null);
+
+    set({ currentProjectId: id });
+    return project;
+  },
+
+  deleteProject: async (id: string) => {
+    await db.projects.delete(id);
+    const { currentProjectId } = get();
+    if (currentProjectId === id) {
+      set({ currentProjectId: null });
+    }
+    await get().loadProjects();
+  },
+}));

frontend/src/types/coverage.ts

@@ -16,6 +16,7 @@ export interface CoverageSettings {
   radius: number;              // km (calculation radius)
   resolution: number;          // meters (grid resolution)
   rsrpThreshold: number;       // dBm (minimum signal to display)
+  heatmapOpacity: number;      // 0.3-1.0 (heatmap layer opacity)
 }
 
 export interface GridPoint {