Fix Chart.js integration for financial chart rendering with candlestick and volume display

Charts.sln

@@ -1,4 +1,5 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
+
+Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.0.32014.148
 MinimumVisualStudioVersion = 10.0.40219.1
@@ -8,6 +9,11 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Functions", "server\Functio
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WebApi.Tests", "server\WebApi.Tests\WebApi.Tests.csproj", "{F2F8E5A3-B3D4-4A5C-9E7F-1A2B3C4D5E6F}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{8EC462FD-D22E-90A8-E5CE-7E832BA40C5D}"
+	ProjectSection(SolutionItems) = preProject
+		server\Directory.Packages.props = server\Directory.Packages.props
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU

README.md

@@ -155,9 +155,40 @@ npm run test:coverage     # With coverage
 # Maintenance
 npm run clean             # Clean all build outputs
 npm run lint:md           # Lint markdown files
-npm run generate:backups  # Refresh both backup-indicators.json and backup-quotes.json (runs prebuild automatically)
+npm run generate:backup-indicators  # Refresh backup-indicators.json (quotes are now fully static)
 ```
 
+### Backup data (indicators & quotes)
+
+The project now ships a single, committed deterministic `backup-quotes.json` (1000 trading days) that is treated as **static**.
+It is consumed directly by the frontend and (via `QuoteFileFallback`) by the Web API. A secondary, embedded algorithmic
+fallback (`QuoteBackup`) generates the same deterministic shape if the JSON file is absent (e.g., trimmed deployment).
+
+Only indicators remain generated from the live API. Regenerate indicators when backend indicator logic changes:
+
+```bash
+npm run generate:backup-indicators
+```
+
+How quotes work now:
+
+- `backup-quotes.json` is authoritative and versioned – no generation script required.
+- `QuoteFileFallback` loads the shared JSON; if missing, it falls back to the deterministic in-code generator (`QuoteBackup`).
+- Frontend tests assert invariants (length 1000, midnight timestamps, price bounds) guaranteeing stability.
+
+Notes:
+
+- Quotes no longer depend on network or runtime availability.
+- Indicator generation still honors `BACKUP_DATA_API_BASE` if you want to point at a non-default API URL during regeneration.
+
+Environment variable (indicators only):
+
+| Variable               | Purpose                                           | Default                 |
+| ---------------------- | ------------------------------------------------- | ----------------------- |
+| `BACKUP_DATA_API_BASE` | Base URL used when regenerating indicators backup | `http://localhost:5000` |
+
+Future ideas: integrity checksum for backups, multiple symbols, adjustable horizons.
+
 **Workspace-specific commands**:
 
 ```bash

client/src/app/components/picker/pick-config.component.ts

@@ -156,7 +156,27 @@ export class PickConfigComponent {
           message: e.message,
           error: e.error
         });
-        this.errorMessage = e.error;
+
+        // Extract meaningful error message from HttpErrorResponse
+        let errorMessage = "An error occurred while adding the indicator.";
+
+        if (typeof e.error === "string") {
+          errorMessage = e.error;
+        } else if (e.error && typeof e.error === "object") {
+          if (e.error.message) {
+            errorMessage = e.error.message;
+          } else if (e.error.error) {
+            errorMessage = e.error.error;
+          } else {
+            errorMessage = `Error ${e.status}: ${e.statusText || "Unknown error"}`;
+          }
+        } else if (e.message) {
+          errorMessage = e.message;
+        } else if (e.statusText) {
+          errorMessage = `Error ${e.status}: ${e.statusText}`;
+        }
+
+        this.errorMessage = errorMessage;
         this.closeButtonLabel = "RETRY";
       }
     });