feat: add SSH URL validation, inline radio buttons in repo creation dialog

RepositoryCreateDialog (already unified, used everywhere):
- Add isSshUrl() helper to detect git@ and ssh:// URLs
- Require SSH key selection when URL is SSH; show error otherwise
- Inline existing/new radio buttons with smaller styling (.repo-mode-radios)

Tests:
- Update repositories-settings-tab.test.tsx to select SSH key for owner/repo mode
- Mock listSSHKeys in tests

Quality gates: tsc --noEmit pass, npm run build pass, 80/80 tests pass

apps/web/src/components/features/project/repository-create-dialog.tsx

@@ -124,6 +124,11 @@ export const RepositoryCreateDialog = ({
 		onClose();
 	};
 
+	const isSshUrl = (url: string): boolean => {
+		const u = url.trim().toLowerCase();
+		return u.startsWith("git@") || u.startsWith("ssh://");
+	};
+
 	const handleSubmit = async (event: React.FormEvent) => {
 		event.preventDefault();
 		setFormError(null);
@@ -140,19 +145,27 @@ export const RepositoryCreateDialog = ({
 			};
 
 			if (createMode === "clone") {
+				let remoteUrl: string;
 				if (useAdvancedUrl) {
 					if (!advancedUrl.trim()) {
 						setFormError("Remote URL is required for advanced cloning");
 						return;
 					}
-					input.remote_url = advancedUrl.trim();
+					remoteUrl = advancedUrl.trim();
 				} else {
 					if (!owner.trim() || !repoName.trim()) {
 						setFormError("Owner and repository name are required");
 						return;
 					}
-					input.remote_url = `git@git.commumedia.org:${owner.trim()}/${repoName.trim()}.git`;
+					remoteUrl = `git@git.commumedia.org:${owner.trim()}/${repoName.trim()}.git`;
 				}
+
+				if (isSshUrl(remoteUrl) && !selectedSshKey) {
+					setFormError("An SSH key is required for SSH URLs");
+					return;
+				}
+
+				input.remote_url = remoteUrl;
 				if (selectedSshKey) {
 					input.ssh_key_id = selectedSshKey;
 				}
@@ -202,24 +215,24 @@ export const RepositoryCreateDialog = ({
 					blank bare repo here.
 				</p>
 				<form onSubmit={handleSubmit} className="stack">
-					<div className="form-field">
-						<label>
+					<div className="form-field repo-mode-radios">
+						<label className="repo-mode-label">
 							<input
 								type="radio"
 								name="repository-mode"
 								checked={createMode === "clone"}
 								onChange={() => setCreateMode("clone")}
 							/>
-							Clone existing repository
+							<span>Clone existing</span>
 						</label>
-						<label>
+						<label className="repo-mode-label">
 							<input
 								type="radio"
 								name="repository-mode"
 								checked={createMode === "blank"}
 								onChange={() => setCreateMode("blank")}
 							/>
-							Create blank repository
+							<span>Create blank</span>
 						</label>
 					</div>
 					<label className="form-field">