feat: breadcrumb navigation, contact validation, confirmation dialogs, wallet persistence

[Ojukwu-Chinedu]

PR Description
Resolves #157, Resolves #158, Resolves #159, Resolves #160
Changes

• closes Implement breadcrumb navigation history #157 — Breadcrumb navigation history
• Created src/components/Breadcrumb.jsx — dynamic breadcrumb component using React Router that renders the current route hierarchy with clickable links
• Updated src/main.jsx to include the Breadcrumb component above routes
  closes Add robust validation to contact fields #158 — Robust contact field validation
• Added validateContact() helper with regex patterns for phone numbers (+1234567890) and Telegram handles (@username)
• Updated both sidebar and profile panel contact inputs with inline error messages
• Form submission is blocked when contact format is invalid
  closes Implement confirmation dialogs for destructive actions #159 — Confirmation dialogs for destructive actions
• Added confirmation modal for wallet disconnect (previously immediate)
• Added confirmation modal for resolving a request (previously immediate)
• Both modals require explicit confirmation click; dismissed actions are aborted
  closes Persist wallet connection state across reloads #160 — Persist wallet connection state across reloads
• Added saveWalletAddress, loadWalletAddress, clearWalletAddress helpers in src/lib/contract.js
• Wallet address is saved to localStorage on connect and cleared on disconnect
• On mount, the app attempts auto-reconnect from saved address
• Added loading indicator ("Reconnecting wallet...") during auto-connect
  Commits (7 files)
  Commit File
  8a8688e src/components/Breadcrumb.jsx
  ab1bdc8 src/main.jsx
  453311b src/pages/Help.jsx
  194d1d6 src/pages/Help.jsx
  55454da src/lib/contract.js
  fd2635c src/pages/Help.jsx
  7701e2b src/App.css

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