Add a collapsible VS Code-style sidebar.

{
  "backend": {
    "author": {
      "email": "drschwabe@fastmail.com",
      "name": "Derrick Schwabe",
      "time": 1787972236
    },
    "commit": "git:sha1:aac706f03d91c7fc41e9eef6acc074add7b7a13c",
    "committer": {
      "email": "drschwabe@fastmail.com",
      "name": "Derrick Schwabe",
      "time": 1787972634
    },
    "manifest": "mmm-manifest:sha256:3c59721a21b6d1221fa3d87d97feee953535393f11c9e233c6d045c579984dbc",
    "message": "Add a collapsible VS Code-style sidebar.\n\na rail, a resizable panel, and panes for\nthe mesh files in data/ and an outline of the open mesh's nodes. CTRL+B\ncollapses it; width, collapsed state and open panes persist locally.\n\nReefjs for rendering the panes.\n\nThe canvas is not reflowed — the dock is fixed and the page is inset with\nbody padding, which nodes and lines follow on their own because they are\nall positioned from client rects.",
    "objectFormat": "sha1",
    "parents": [
      "git:sha1:52b58599a44e3baac1c76793ba9b1cba527338e2"
    ],
    "ref": "refs/heads/master",
    "summary": "Add a collapsible VS Code-style sidebar.",
    "tree": "git:sha1:96632e3a6a251b8b056afe71b346285df89edc8c",
    "type": "git"
  },
  "issuedAt": "2026-08-29T07:25:36.976Z",
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