feat(stats): add stats fragment with charts for timer data

[ardevd]

• Add vico views dependency for charts
• Create SimplePieChartView for tag breakdown
• Add StatsFragment with tag pie chart and duration column chart
• Add stats menu item to RecordsListFragment
• Include logic to handle empty states and format axes appropriately

[Copilot]

Pull request overview

Adds a new “Stats” screen to visualize timer/record data with a tag breakdown pie chart and a per-day duration column chart, and wires navigation to it from the records list.

Changes:

• Add the Vico Views chart dependency and a basic chart style.
• Introduce StatsFragment + fragment_stats.xml to render charts with time-range chips.
• Add a “Stats” action to the records list menu (including icon + strings).

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
gradle/libs.versions.toml	Adds Vico version + vico-views library alias.
app/build.gradle.kts	Includes Vico Views dependency for chart rendering.
app/src/main/res/values/themes.xml	Adds a chart style resource used by the Vico chart view.
app/src/main/res/values/strings.xml	Adds strings for the new “Stats” menu item.
app/src/main/res/menu/menu_records_list.xml	Adds the “Stats” toolbar/menu action.
app/src/main/res/layout/fragment_stats.xml	New UI layout for stats (chips, charts, loading/error views).
app/src/main/res/drawable/ic_charts.xml	New chart icon used by the menu item.
app/src/main/java/net/ardevd/tagius/features/stats/ui/StatsFragment.kt	Implements stats UI logic: range chips, record aggregation, feeding chart models.
app/src/main/java/net/ardevd/tagius/features/stats/ui/SimplePieChartView.kt	Adds a custom pie chart view for tag breakdown.
app/src/main/java/net/ardevd/tagius/features/records/ui/list/RecordsListFragment.kt	Navigates to StatsFragment when the “Stats” action is selected.

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