Refactor WebPageController to use IPriceController and ComparisonResult

[Copilot]

WebPageController duplicated chart coordinate logic already handled by ChartBuilder, and returned a loosely-typed Map<String, Object> instead of the existing ComparisonResult/ChartData domain types — diverging from the REST API path.

Changes

• Replaced MarketDataService with IPriceController — the same interface used by PriceComparisonApiController, routing web requests through PriceComparisonService → ChartBuilder like the API does
• Removed ~80 lines of manual chart calculation — min/max price scanning, coordinate mapping, SVG path building now delegated to ChartBuilder
• Replaced Map<String, Object> result with ComparisonResult — strongly-typed domain object added directly to the Thymeleaf model; template property access already matched the getters

// Before
private final MarketDataService marketDataService;
// ... 80 lines of manual chart math ...
Map<String, Object> result = new HashMap<>();
result.put("chartData", chartData); // loosely typed

// After
private final IPriceController priceController;
// ...
ComparisonResult result = priceController.comparePrices(symbol1, symbol2, start, end);
model.addAttribute("result", result);

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[lukepring]

@copilot please review the conflict resolution i did to ensure code still runs as intended

[Copilot]

@lukepring The model claude-sonnet-4.6 is not available for your account. This can happen if the model was disabled by your organization's policy or if your Copilot plan doesn't include access to it.

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@lukepring The model claude-sonnet-4.6 is not available for your account. This can happen if the model was disabled by your organization's policy or if your Copilot plan doesn't include access to it.

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[Copilot]

@lukepring The model claude-sonnet-4.6 is not available for your account. This can happen if the model was disabled by your organization's policy or if your Copilot plan doesn't include access to it.

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[Copilot]

@lukepring The model claude-sonnet-4.6 is not available for your account. This can happen if the model was disabled by your organization's policy or if your Copilot plan doesn't include access to it.

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[lukepring]

@copilot @copilot please review the conflict resolution i did to ensure code still runs as intended

[Copilot]

@lukepring The model claude-sonnet-4.6 is not available for your account. This can happen if the model was disabled by your organization's policy or if your Copilot plan doesn't include access to it.

You can try again without specifying a model (just @copilot) to use the default, or choose a different model from the model picker.

If you want to contact GitHub about this error, please mention the following identifier so they can better serve you: ed8c72e1-7935-4d8a-bed5-776a9ef47995

[Copilot]

@lukepring The model claude-sonnet-4.6 is not available for your account. This can happen if the model was disabled by your organization's policy or if your Copilot plan doesn't include access to it.

You can try again without specifying a model (just @copilot) to use the default, or choose a different model from the model picker.

If you want to contact GitHub about this error, please mention the following identifier so they can better serve you: ed8c72e1-7935-4d8a-bed5-776a9ef47995

[Copilot]

@copilot @copilot please review the conflict resolution i did to ensure code still runs as intended

Reviewed and fixed the merge regression in commit 38c290f: WebPageController now delegates to IPriceController.comparePrices, uses the typed ComparisonResult/ChartData, and the reintroduced manual chart math + Map have been removed. Local mvn compile passes; no UI changes.