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feat(svg): Add collapsible nodes for roles, plays, and blocks in SVG output (#247)

## Summary

This PR implements collapsible nodes in the SVG output for the Ansible
Playbook Grapher, addressing [issue
#77](https://github.com/haidaraM/ansible-playbook-grapher/issues/77).

## Feature Details
- Adds a collapse/expand button to all role, play, and block nodes in
the SVG output.
- Clicking the button hides or shows all descendant nodes and edges
recursively, making large graphs easier to navigate.
- The button is always visible for the current node, so users can always
expand collapsed nodes.
- The implementation uses the existing `<link>` structure in the SVG to
determine which nodes and edges to hide/show, with no extra attributes
required.
- The code is generalized for all node types (role, play, block).
- Added a new CLI flag `--collapsible-nodes` to make this feature
optional (disabled by default).

## Usage
- Generate an SVG with the `--collapsible-nodes` flag:
`ansibleplaybookgrapher my_playbook.yml --collapsible-nodes`
- Open it in a browser and use the +/- buttons on plays, roles, and
blocks to expand/collapse sections of the graph.

## Screenshots
- When using the flag, each play, block, and role node has a
collapse/expand button.
- Clicking the button toggles visibility of all descendant nodes and
edges recursively.
- The button's text changes from "-" to "+" when collapsed and back to
"-" when expanded.


![node-collapsing](https://github.com/user-attachments/assets/8fc83d89-7e6b-4e93-85f2-47476a783e75)

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Source Files on job py3.12-ansible2.18.* - 15097748826.6