Explain inter-rater reliability before the first reviewer pair completes

[InfinityBowman]

Follow-up to #850. The inter-rater reliability section only rendered once at least one reviewer pair had produced comparable answers, so on a dual-review project where nobody has finished yet the feature left no trace on the overview at all - no heading, no hint that the numbers are coming.

What changed

• The section keeps its heading whenever any study has two different reviewers assigned, and replaces the cards with one line: "Agreement appears once both reviewers of a study have completed their appraisals. N studies have two reviewers."
• The subtitle ("Before reconciliation, pooled across reviewer pairs") is suppressed while empty, since it describes numbers that are not on screen.
• Single-reviewer projects still render nothing. An empty reliability card there is not a hint, it implies a workflow the user did not choose.

This matches the existing Results section pattern ("Figures and tables appear once the first study is finalized.").

Not covered here

calculateProjectReliability also drops a cell when both reviewer checklists are complete but the pair is rejected - same assignee, one unassigned, or missing checklist data. To the user that is indistinguishable from "no pairs yet" even though the pair is finished. Surfacing it needs the calculator to return a skipped-cell count alongside the tools, which changes its signature, so it is left for a separate change.

Verification

• pnpm --filter web test - 324 passed, including a new case covering the empty state
• pnpm typecheck - clean

https://claude.ai/code/session_01H77BMkZ9GhK8D98TG4cpTg

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Review configuration:

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: a09642d8-60f4-4e0c-b398-6cd7ab27457b

📥 Commits

Reviewing files that changed from the base of the PR and between 3d6b9a2 and f3e883c.

📒 Files selected for processing (3)

• packages/web/src/components/project/overview-tab/OverviewTab.tsx
• packages/web/src/components/project/overview-tab/ReliabilitySection.tsx
• packages/web/src/components/project/overview-tab/__tests__/ReliabilitySection.test.tsx

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