[Spec 425] Dashboard chrome cleanup

[waleedkadous]

Summary

• Replace "Agent Farm" branding in dashboard header with <project-name> dashboard
• Remove redundant footer status bar (builder/shell/file counts)
• Update browser tab title and index.html initial title
• Clean up legacy Playwright tests targeting non-existent UI elements

Closes #425

Changes

• App.tsx: Header shows {workspaceName} dashboard with falsy fallback, footer removed
• index.html: Title changed from "Agent Farm Dashboard" to "dashboard"
• index.css: Removed .header-meta and .status-bar CSS rules
• tower-integration.test.ts: Updated assertion from "Agent Farm" to "dashboard"
• dashboard-bugs.test.ts: Removed 8 legacy Bug Scaling Crisis - AI Autonomy Decreases as Projects Grow #3 tests targeting non-existent selectors, preserved split-pane layout test

Testing

• All 85 unit test files pass (1705 tests via Vitest)
• Build passes
• Playwright E2E tests need verification with live tower (cannot run in builder worktree)

Spec

Link: codev/specs/425-dashboard-chrome-cleanup.md

Review

Link: codev/reviews/425-dashboard-chrome-cleanup.md