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/git/WorkspaceSidebar.tsx

@@ -1,9 +1,9 @@
 import type { GitRepository } from "../../../types/git-repository";
-import type { GitStatus } from "../../../api/git_repositories";
+import type { GitStatus } from "../../../api/git-repositories";
 import type { ToolType } from "../../../types/tool-type";
 import { FileBrowser } from "./FileBrowser";
-import { CommitPanel } from "../../../components/commit-panel";
-import { InstanceList } from "../../../components/instance-list";
+import { CommitPanel } from "../git/CommitPanel";
+import { InstanceList } from "../session/InstanceList";
 
 interface WorkspaceSidebarProps {
 	projectId: string;
@@ -29,10 +29,7 @@ export const WorkspaceSidebar = ({
 			<div className="sidebar-section">
 				<label className="form-field">
 					Repository
-					<select
-						value={repoId}
-						onChange={(e) => onRepoChange(e.target.value)}
-					>
+					<select value={repoId} onChange={(e) => onRepoChange(e.target.value)}>
 						{repositories.map((repo) => (
 							<option key={repo.id} value={repo.id}>
 								{repo.name}