refactor(teams_selection): centralize team selection in TeamSelectionService

[sawankshrma]

Adds a TeamSelectionService as the single source of truth for the active team filter, used by the heatmap, report page/modal, and evidence components. Removes selectedTeams from ReportConfig (previously stored inside localStorage, now only persists per-session)

• Resolves Issue: Global Team Selection object #586

Changes:

• TeamSelectionService has selectedTeams, effectiveTeams, selectedGroupName, and isAllSelected as computed signals.
• CircularHeatmapComponent: derives fiiltersTeams/filtersTeamGroups from the service; syncs SectorService via effect()
• ReportComponent/ReportConfigModalComponent: selectedTeams is pulled out of ReportConfig entirely. Team selection now flows through the service instead of being persisted config. The modal's result type changed from ReportConfig to { config, selectedTeams } since they're no longer the same object.
• AddEvidenceModalComponent/EvidencePanelComponent: injects service directly instead of passing allTeams/teamGroups through dialog data
• TeamSelectorComponent: makes selectedTeams a plain input, selectAllTeams()/deselectAllTeams()/selectGroup() just emit rather than mutate local state.