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/scripts/check-structure.js

@@ -19,7 +19,9 @@ function checkFileSize(filePath, maxLines = 300) {
 	const content = fs.readFileSync(filePath, "utf-8");
 	const lines = content.split("\n").length;
 	if (lines > maxLines) {
-		console.error(`❌ OVERSIZED (${lines} lines): ${path.relative(SRC_DIR, filePath)}`);
+		console.error(
+			`❌ OVERSIZED (${lines} lines): ${path.relative(SRC_DIR, filePath)}`,
+		);
 		errors++;
 	}
 }