Add haptic feedback when selecting metrics chart points

[Dimillian]

Motivation

• Provide tactile feedback on the Metrics screen when the user drags or taps the chart selection to reveal the tooltip and summary cards.
• Improve discoverability and perceived responsiveness of the chart interaction by leveraging the existing haptic manager.

Description

• Imported Env and used the existing HapticManager to fire haptics from the metrics chart component.
• Added @State private var lastHapticDayStart: Date? to deduplicate repeated haptics for the same day selection.
• Added .onChange(of: selectedDate) handler that maps the selection to the corresponding day and calls HapticManager.shared.fireHaptic(.timeline) when the selection changes to a new day.
• Changes applied to Packages/Account/Sources/Account/Metrics/AccountMetricsComponents.swift to wire up the interaction.

Testing

• No automated tests were executed in this environment.
• The change compiles locally was not verified here, and no CI or unit/UI tests were run as part of this rollout.
• Manual validation on device/simulator is recommended to confirm haptic behavior and ensure there are no runtime issues.

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Codex Task