fix(predict): wires homepage_positions entry_point on Predict Feed Viewed event

[ghgoodreau]

The homepage PredictionsSection navigated to the PredictFeed without passing an entryPoint param, so Predict Feed Viewed never reported homepage_positions. Add handleViewAllFromPositions handler that passes entryPoint: HOMEPAGE_POSITIONS when View All is tapped from the positions section (default and positions-only modes).

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Quality Gate passed

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✅ E2E Fixture Validation — Schema is up to date
16 value mismatches detected (expected — fixture represents an existing user).
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