refactor: rename files to PascalCase components and kebab-case APIs (Task 4.4)

- Rename all component files to PascalCase matching exported names
- Move components into feature directories (git/, session/, project/, terminal/, workspace/, ui/, layout/)
- Rename all page files to PascalCase with Page suffix
- Rename all API files to kebab-case
- Update all imports across codebase with corrected relative depths
- Preserve git history via git mv

Quality gates: tsc (pass), eslint (pass), 66/74 tests pass (8 pre-existing failures)
Refs: repo-restructure Task 4.4

apps/web/src/components/features/dashboard/RecentSessionsSection.tsx

@@ -24,7 +24,9 @@ export const RecentSessionsSection = ({
 					<article className="recent-session-item" key={session.id}>
 						<div className="recent-session-info">
 							<span className="recent-session-name">
-								{session.display_name || session.tool_type_name || "Unnamed Session"}
+								{session.display_name ||
+									session.tool_type_name ||
+									"Unnamed Session"}
 							</span>
 							<span className="muted">
 								{session.project_name} · {session.tool_type_name}