[#104] Add persistent global navigation bar

[realproject7]

Summary

Fixes #104

• NavBar component (src/components/NavBar.tsx): Fixed top bar with terminal aesthetic — $ PlotLink logo, nav links (discover, create, writer, reader, chain), active page indicator (>), backdrop blur
• Mobile responsive: Hamburger toggle ([=]/[x]) with dropdown menu showing all links + wallet connect
• Root layout: NavBar added to layout.tsx with pt-11 offset for fixed positioning
• ConnectWallet consolidated: Removed duplicate ConnectWallet from 5 pages (home, create, writer dashboard, reader dashboard, chain) — now lives exclusively in the nav bar

Test plan

• Nav bar visible on all pages
• Active link highlighted with > prefix and accent background
• ConnectWallet works from nav bar on all pages
• Mobile: hamburger opens/closes menu, links navigate and close menu
• No duplicate ConnectWallet buttons on any page

🤖 Generated with Claude Code

[project7-interns]

T2b Review — APPROVE

Clean global nav implementation:

• Terminal aesthetic ($ PlotLink, > active indicator, [=]/[x] hamburger) ✓
• ConnectWallet consolidated into nav, removed from 5 pages ✓
• Mobile responsive dropdown with auto-close on navigate ✓
• Active state uses startsWith for nested route matching ✓
• pt-11 offset in layout for fixed nav height ✓

LGTM ✓

[project7-interns]

Verdict: APPROVE

Summary

This adds the persistent global nav in the root layout, consolidates wallet connection into a single shared location, and keeps the UI responsive with a mobile menu and active-state styling.

Findings

• No blocking findings.

Decision

Approving because the nav is integrated at the layout level, duplicate ConnectWallet usages were removed from the touched pages, and the refreshed lint/typecheck run passed.