Added bodies to the list view and graph view

[NethmikaKekuu]

This closes #174

Summary

• Adds a third drill-down level — Bodies — to the Ministries → Departments & People stepper, so selecting a department now shows the bodies under it (with a Bodies/People pill toggle, matching the existing Departments/People pattern).
• Extracts the repeated breadcrumb title+badge markup and the departments/people toggle into two new reusable components: HierarchyEntry and PillTabToggle, plus a HierarchyConnector for the visual link between stepper levels.
• Wires up department selection end-to-end: clicking a department sets it in the URL (?department=), restores it on reload, and clicking the department name in the stepper breadcrumb jumps back to the department list.
• Adds a mocked getBodiesByDepartment API (mockBodiesData.js, useBodiesByDepartment.js) as a placeholder until the real bodies endpoint exists.
• Each department card carries a single link icon in its corner (linking to /department-profile/:id), and the Bodies view shows one shared "History" link next to the pill toggle rather than duplicating it per tile.

Test plan

• Select a ministry → department → verify the Bodies step appears and lists mock bodies for that department
• Confirm the department link icon and the Bodies "History" link both navigate to /department-profile/:id
• Reload the page with ?ministry= and ?department= params set — verify the stepper restores to the correct step
• Click the ministry/department breadcrumb names to confirm back-navigation works at each level

[gemini-code-assist]

Code Review

This pull request introduces a third level of hierarchy ('Bodies') under departments in the organization view. It adds mock data, a query hook, and new UI components (HierarchyConnector, HierarchyEntry, and BodyTab) to display bodies, while updating MinistryCardGrid, DepartmentTab, GraphComponent, and Drawer to support navigation, breadcrumbs, and interactive graph nodes for bodies. The review feedback highlights several critical improvements: fixing a back-navigation bug in GraphComponent where the 'ministry' URL parameter is unconditionally deleted, properly cleaning up the abort signal listener in getBodiesByDepartment to prevent memory leaks, adding safe fallbacks for selectedPresident in BodyTab to avoid potential crashes, correcting an invalid CSS value ('none') in MinistryCardGrid, and ensuring consistent capitalization of the 'Poppins' font family.

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