refactor: extract CSS modules for terminal and git components (Task 2.2)

- Create TerminalComponent.module.css with terminal-* styles
- Create GitToolbar.module.css with git toolbar styles
- Create CommitDialog.module.css with commit dialog styles
- Create MergeDialog.module.css with merge dialog styles
- Create FileEditor.module.css with file editor styles
- Update all components to import their CSS modules
- Remove extracted rules from styles.css (~441 lines removed)

Quality gates: tsc (pass), eslint (pass), build (pass)
Refs: repo-restructure Task 2.2

apps/web/src/components/features/git/CommitDialog.module.css

@@ -0,0 +1,130 @@
+.commitDialog {
+  background: var(--panel);
+  border-radius: 14px;
+  width: 100%;
+  max-width: 600px;
+  max-height: 90vh;
+  overflow: auto;
+  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
+}
+
+.dialogHeader {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 1rem 1.5rem;
+  border-bottom: 1px solid var(--border);
+}
+
+.dialogHeader h3 {
+  margin: 0;
+  font-size: 1.1rem;
+}
+
+.dialogClose {
+  background: none;
+  border: none;
+  font-size: 1.5rem;
+  cursor: pointer;
+  color: var(--muted);
+  padding: 0;
+  width: 2rem;
+  height: 2rem;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 6px;
+}
+
+.dialogClose:hover {
+  background: var(--bg);
+  color: var(--ink);
+}
+
+.dialogBody {
+  padding: 1.5rem;
+}
+
+.fileInfo {
+  margin: 0 0 1rem;
+  color: var(--muted);
+}
+
+.diffPreview {
+  margin-bottom: 1.5rem;
+}
+
+.diffPreview h4 {
+  margin: 0 0 0.75rem;
+  font-size: 0.9rem;
+  color: var(--muted);
+}
+
+.diffContent {
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  overflow: auto;
+  max-height: 300px;
+  font-family: 'Fira Code', 'Monaco', 'Courier New', monospace;
+  font-size: 13px;
+}
+
+.diffLine {
+  display: flex;
+  padding: 0.15rem 0.5rem;
+  gap: 0.5rem;
+}
+
+.diffLineNumber {
+  color: var(--muted);
+  min-width: 2rem;
+  text-align: right;
+  user-select: none;
+}
+
+.diffMarker {
+  width: 1rem;
+  text-align: center;
+  font-weight: bold;
+}
+
+.diffAdded {
+  background: rgba(16, 185, 129, 0.1);
+}
+
+.diffAdded .diffMarker {
+  color: #059669;
+}
+
+.diffRemoved {
+  background: rgba(239, 68, 68, 0.1);
+}
+
+.diffRemoved .diffMarker {
+  color: #dc2626;
+}
+
+.diffSame {
+  background: transparent;
+}
+
+.diffLineContent {
+  flex: 1;
+}
+
+.warningMessage {
+  padding: 0.75rem;
+  background: rgba(245, 158, 11, 0.1);
+  color: #d97706;
+  border-radius: 8px;
+  margin-bottom: 1rem;
+}
+
+.dialogFooter {
+  display: flex;
+  justify-content: flex-end;
+  gap: 0.75rem;
+  padding: 1rem 1.5rem;
+  border-top: 1px solid var(--border);
+}