Explain how studies get added, and make the setup card's add button primary

[InfinityBowman]

What changed

Setup card (Overview)

• The Add more button in the Add studies cell is now the primary blue variant, so the next action stands out from the count line.
• Once all four steps are done, the ghost "Finish later" in the header becomes an outlined "Done". Same dismiss handler.

All studies

• New StudiesExplainer card above the list, in the same chrome as the setup card. Three columns: drop PDFs anywhere on the page, import through the Add studies button (inline link opens the sheet), or attach a PDF to a study later by expanding it.
• Renders only once studies exist, so it never competes with the empty-project add form.
• Dismissal is stored in localStorage keyed by user id, wrapped in try/catch for Safari private mode. Server-side persistence so it follows the user across devices is Persist dismissed UI hints in user preferences so they follow the user across devices #788.

Verification

• tsc --noEmit clean
• pnpm lint clean
• pnpm --filter web test: 44 files, 312 tests passed

https://claude.ai/code/session_0127k6bNMdQoMLtEfnAQdAyV

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 71ff50a and db82c38.

📒 Files selected for processing (3)

• packages/web/src/components/project/all-studies-tab/AllStudiesTab.tsx
• packages/web/src/components/project/all-studies-tab/StudiesExplainer.tsx
• packages/web/src/components/project/setup/ProjectSetupCard.tsx

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