Define canonical Findings Table screen

Document the layout, behavior, and consistency of the Findings Table screen.

ui/SCREEN_FINDINGS.MD

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+Screen: Findings Table
+
+Purpose:
+Primary analyst workspace for reviewing results.
+
+Layout:
+- Full-width table
+- Dense rows
+- Sticky header
+- Filters above table
+
+Columns (left to right):
+- Severity (icon + color)
+- Summary
+- Source
+- Confidence
+- Timestamp
+- Actions
+
+Behavior:
+- Default sort: severity desc, timestamp desc
+- Row hover reveals secondary actions
+- Clicking a row opens a detail panel (not a new page)
+
+Animation:
+- New findings animate in briefly
+- Severity changes animate once
+- Table interactions are instant
+
+Consistency:
+This screen must look and behave the same in all applications.