fix: container mount permissions, terminal shift, ESC capture

Bug 1 — in-container repo mounting:
- docker-compose.yml: added /data/working-copies:/data/working-copies mount
  to API container so workspace dirs are visible on host filesystem
- Dockerfile: create /data/working-copies dir in image

Bug 2 — /home/user not writable:
- workspace_manager.py: chmod 777 workspace dirs + 666 files after clone
  and after sync, so any container user can write
- manifest_compiler.py: explicit mkdir + chown + chmod 755 for home dir
  in generated Dockerfile

Bug 3 — terminal text shifts left on typing:
- terminal.tsx: removed manual term.refresh() after fit (caused reflow)
- Track lastSentCols/lastSentRows and only send resize when dimensions
  actually changed, preventing resize feedback loops

Bug 4 — ESC key captured by terminal:
- terminal.tsx: attachCustomKeyEventHandler allows ESC to propagate to
  browser when not in alternate buffer (vim/tmux), so modals/navigation
  work; ESC still sent to PTY when in vim/tmux alternate screen

Quality gates: ruff clean, tsc --noEmit clean, pytest workspaces (9 passed)

apps/web/src/components/start-tool-fab.tsx

@@ -71,16 +71,12 @@ export function StartToolFAB() {
 							</p>
 						) : !selectedWorkspace ? (
 							<div className="form-group">
-								<label htmlFor="fab-workspace-select">
-									Select a workspace
-								</label>
+								<label htmlFor="fab-workspace-select">Select a workspace</label>
 								<select
 									id="fab-workspace-select"
 									value=""
 									onChange={(e) => {
-										const ws = workspaces.find(
-											(w) => w.id === e.target.value,
-										);
+										const ws = workspaces.find((w) => w.id === e.target.value);
 										if (ws) setSelectedWorkspace(ws);
 									}}
 								>
@@ -97,8 +93,7 @@ export function StartToolFAB() {
 								<div className="tool-starter-header">
 									<h4>
 										{selectedWorkspace.project_name} /{" "}
-										{selectedWorkspace.repo_name} /{" "}
-										{selectedWorkspace.name}
+										{selectedWorkspace.repo_name} / {selectedWorkspace.name}
 									</h4>
 									<button
 										className="ghost-button small"