feat: privacy score badge on stealth address rows (#68)

[hartz0]

closes #68

Summary

Implements issue #68 — local privacy score badge on each stealth address row.

Changes

src/lib/privacy-score.ts — pure scoring function, no network calls

• Three weighted factors: address reuse (50%), balance accumulation (30%), transfer timing regularity (20%)
• Returns score 0–100 and grade: green ≥75, yellow 40–74, red <40

src/lib/privacy-score.test.ts — 10 unit tests (vitest), all passing

src/components/PrivacyBadge.tsx — inline dot+label badge; click opens modal with per-factor breakdown and explanation

src/components/HorizenReceive.tsx / StellarReceive.tsx — badge rendered inline on each stealth address row next to the balance

src/context/ActivityContext.tsx — session store that persists scanned addresses so the history page can read them

src/pages/History.tsx — new /history route listing all scanned addresses with badge per row

src/components/Header.tsx / src/App.tsx — History nav link and route wired in

Acceptance criteria

• Score computation function + tests
• Badge rendered on receive rows + history rows
• Explanation modal
• Scoring is local-only, no network calls

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[truthixify]

Privacy score logic + PrivacyBadge component + tests look good. 4 conflicts to resolve:

• package.json: re-add any deps you needed on top of develop's
• src/App.tsx: keep develop's routes
• src/components/StellarReceive.tsx: keep develop's content (Worker integration, sponsored withdrawal, etc.) and graft your PrivacyBadge mount in the row
• src/pages/History.tsx: add/add conflict, develop already has its version from a prior PR. Take develop's structure and add your privacy score column/badge where appropriate

git fetch origin
git rebase origin/develop
git push --force-with-lease