Trends: chart key shows average price per station + descriptor footer
Legend rows now show each station's average over the days shown in brackets (pence; signed +X.Xp in vs-cheapest mode, matching the list-row deltas). Footer under the key explains the figure per mode. averagePence helper (nil for empty series) + 3 tests; -showTrends becomes a permanent QA hook like -showKeySheet.
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@@ -156,3 +156,5 @@
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"No price history yet" = "No price history yet";
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"First snapshot %@ — a few days are needed to draw a trend." = "First snapshot %@ — a few days are needed to draw a trend.";
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"Prices are recorded each day FuelBoard's relay runs — check back in a few days." = "Prices are recorded each day FuelBoard's relay runs — check back in a few days.";
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"Average price over the days shown" = "Average price over the days shown";
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"Average pence above the day's cheapest favourite" = "Average pence above the day's cheapest favourite";
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