feat(visualization): cap floor label depth slider at the loaded project's depth

[Patrez]

Description

The floor label depth slider was hardcoded to a max of 8, which is lower than the actual depth of many real codebases. This PR replaces the static cap with a dynamic one computed from the loaded project's tree.

What changed:

• New selector maxFolderDepthSelector (visualization/app/codeCharta/state/selectors/accumulatedData/maxFolderDepth.selector.ts) walks the unified map node and returns the deepest folder depth.
• The slider in areaSettingsPanel binds its [max] to this selector via async pipe, with a ?? 15 fallback for the pre-load state.
• 4 selector tests covering: no project, leaves-only root, nested tree, empty root.

Result: sliding all the way right now labels every folder level of whatever's loaded, and the cap matches the data instead of an arbitrary number.

Definition of Done

• Changes have been manually tested
• There are automated tests for newly written code
• Documentation update — not needed (no user-facing docs reference the previous 8-cap)
• CHANGELOG.md — not updated in this fork (please confirm fork's convention)

Notes

• Branch targets ci/notify-codebase-architectures rather than main because the floor label depth feature itself (PR Add configurable floor label depth #9 upstream, commit 72b037c) is on that branch but not yet on the fork's main. Adjust the base if you'd prefer main as the target.
• A follow-up performance pass is desirable: setting floorLabelDepth currently triggers a full map re-render plus per-level canvas/texture re-allocation. Sliding to deeper values exposes this cost. See floorLabelDrawer.ts and actionsRequiringRerender.ts for the hot path.

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com

[Copilot]

Pull request overview

This PR removes the hardcoded floor label depth slider cap (previously 8) and replaces it with a dynamic maximum derived from the loaded project’s map hierarchy, so the UI can represent deeper real-world codebases.

Changes:

• Added maxFolderDepthSelector, which traverses the loaded unifiedMapNode to compute the maximum labelable folder depth.
• Wired the Floor Label Depth slider’s [max] to maxFolderDepthSelector (with a ?? 15 fallback before a project is loaded).
• Added unit tests covering multiple project/tree shapes for the new selector.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
visualization/app/codeCharta/ui/ribbonBar/areaSettingsPanel/areaSettingsPanel.component.ts	Selects maxFolderDepthSelector and exposes it to the template as maxFloorLabelDepth$.
visualization/app/codeCharta/ui/ribbonBar/areaSettingsPanel/areaSettingsPanel.component.html	Binds the floor label depth slider [max] to the computed depth (fallback 15).
visualization/app/codeCharta/state/selectors/accumulatedData/maxFolderDepth.selector.ts	Implements the selector that computes the max folder depth from unifiedMapNode.
visualization/app/codeCharta/state/selectors/accumulatedData/maxFolderDepth.selector.spec.ts	Adds tests for the selector across “no project”, shallow, nested, and empty-root cases.

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