fix: deselecting group chip reselects All teams

[piyush140104]

Problem

On the heatmap page, once a team group chip (e.g. Customer, Internal) is selected there is no way to deselect it. Clicking it again does nothing and the chip stays permanently stuck in the selected state.

Root Cause

In toggleTeamGroupFilter() inside circular-heatmap.component.ts, the else branch which runs when the chip is already selected only had a console.log and returned immediately. There was no deselection logic.

Fix
Replaced chip.toggleSelected() calls with data driven logic using filtersTeamGroups as the single source of truth since the template already binds [selected] to filtersTeamGroups[group.key]. Selecting a group chip now deselects all other group chips first. Deselecting a group chip clears all team filters, resets hasTeamsFilter and automatically reselects the All teams chip. setVisibleTeams() is now called once after the loop instead of inside it.

Reviewers
@vbakke @wurstbrot

Closes #524

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