Allow navigation to and between activities in the heatmap

[vbakke]

By adding the '#{uuid}' in the url, one can now link to a specific activity in the heatmap, and also navigate between the activities using the dependency tree

[Copilot]

Pull Request Overview

Enables deep-linking to specific heatmap activities via URL fragments (#uuid) and supports navigation between activities through the dependency graph.

• Read and react to URL fragments to open the corresponding activity.
• Update URL fragment when opening/closing the activity overlay; add dependency-graph click handler to navigate to activities.
• Change activity detail opening to use UUIDs instead of names.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/assets/Markdown Files/TODO-v4.md	Moves the heatmap deep-link/navigation item from TODO to Done.
src/app/pages/circular-heatmap/circular-heatmap.component.ts	Adds fragment handling (ActivatedRoute), URL updates (Router/Location), navigation helpers, and switches activity detail opening to UUID.
src/app/pages/circular-heatmap/circular-heatmap.component.html	Wires dependency graph click event and passes activity UUID to detail opener.

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