fix(desktop): sync v1 terminal dimensions to backend on connect (#3545)

When panes mount during new-workspace / preset flows, attachToContainer's
fit() can run before flex layout resolves, leaving the backend PTY spawned
at stale defaults (shell prompt wraps wrong until a manual resize).

Mirror v2's sendResize-on-open pattern: once createOrAttach succeeds,
re-fit against the now-settled container and push the real dims.

Author: Kitenite

apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/Terminal/hooks/useTerminalLifecycle.ts

@@ -260,6 +260,17 @@ export function useTerminalLifecycle({
 
 		const { xterm, fitAddon, searchAddon } = cached;
 
+		// Called after createOrAttach resolves: re-fit against the now-settled
+		// container and push dims to the backend. Guards against stale sizes
+		// from attachToContainer's fit running before flex layout resolved
+		// (e.g. preset tabs, new workspace bulk creation). Mirrors v2's
+		// terminal-ws-transport sendResize-on-open.
+		const syncBackendDimensions = () => {
+			if (container.clientWidth === 0 || container.clientHeight === 0) return;
+			fitAddon.fit();
+			resizeRef.current({ paneId, cols: xterm.cols, rows: xterm.rows });
+		};
+
 		// Attach the wrapper div to the live container.
 		// The cache creates a ResizeObserver that calls fitAddon.fit() and
 		// forwards resize events to the backend — no separate resize handler needed.
@@ -383,6 +394,7 @@ export function useTerminalLifecycle({
 									return;
 								}
 								setConnectionError(null);
+								syncBackendDimensions();
 								pendingInitialStateRef.current = result;
 								maybeApplyInitialState();
 								if (!command) {
@@ -595,6 +607,7 @@ export function useTerminalLifecycle({
 									v1TerminalCache.startStream(paneId);
 									v1TerminalCache.setStreamReady(paneId);
 									markTerminalSessionReady(paneId);
+									syncBackendDimensions();
 
 									const storedColdRestore = coldRestoreState.get(paneId);
 									if (storedColdRestore?.isRestored) {