feat: update business modules with new design system (VSN-2272)

Summary

• Update business modules (infrastructure, fleets, chauffeur, contract, RH, geolocalisation, planning) with new design system
• Migrate infrastructure forms (agency, department, sector, lot) from MUI to shadcn/Tailwind CSS with FormField component
• Rewrite ColorPicker components (ColorOption, ColorPickerInput) from MUI to Tailwind with lucide-react icons
• Unify primary color from #746CD4 to #6C5CE7 across 22 files in all business modules
• Add missing usager table column widths and representative field definitions
• Merge latest develop (including VSN-2271) into branch and resolve conflicts

Changes

Migrated: Infrastructure Forms (src/shared/sections/exploitation/infrastructure/)

• agency-form — Migrated from MUI Grid/Box/Typography to shadcn FormField + Tailwind layout
• department-form — Migrated to shadcn FormField, added missing navigation props
• sector-form — Migrated to shadcn FormField + Tailwind layout
• lot-form — Updated color references

Rewritten: Department ColorPicker (src/shared/sections/exploitation/infrastructure/department/components/)

• ColorOption — Rewritten from MUI Box/Tooltip to Tailwind with lucide-react Check icon
• ColorPickerInput — Rewritten from MUI Popover/Grid/Typography to shadcn Popover + Label + Tailwind

Updated: Infrastructure View

• infastructure-view — Updated primary color reference

Updated: Fleets Module (src/shared/sections/fleets/)

• fuel-type-new-view — Color unification #746CD4 → #6C5CE7
• vehicle-new-view — Color unification
• vehicle-brand-model-new-view — Color unification
• vehicle-type-new-view — Color unification
• service-provider-form — Color unification
• interventions-new-view — Color unification

Updated: Chauffeur Module (src/shared/sections/chauffeur/)

• schedule-utils — Color unification
• combined-table-validation — Color unification

Updated: Contract Module (src/shared/sections/contract/)

• styles.ts — Refined borders (3px → 1px), updated hover states, background colors
• contract-new-view — Color unification

Updated: RH Module (src/shared/sections/rh/)

• stytles.ts (rdv-annuel) — Color unification
• candidature-table-row — Color unification
• formulaire-table-row — Color unification

Updated: Other Modules

• driver-comparison/styles.ts — Color unification (geolocalisation)
• location/schedule-utils — Color unification (planning)

Updated: Usager Table & Fields

• usager-table — Added min-widths for representative, department code, circuit, class level, state, and code columns
• form-fields-representative — Added missing assignedPersonNames field definition to fix runtime error in DuplicableField

Fixes

• Resolved 5 merge conflicts after merging latest develop (VSN-2271)
• Fixed missing defaultAgencyName, departmentIds, onNavigate props in DepartmentFormProps
• Fixed duplicate code in interventions-new-view from merge conflict
• Reverted jwt-login-view.tsx to develop version (preserves CSS variable references from VSN-2271)
• Fixed entityIds type error (string[] | undefined → default fallback)