Add canvas foundation: SVG viewport, pan/zoom/pinch, geometry lib (#9)

The editor's technically-riskiest slice, built against mock data so #11
only adds interactions on top.

- lib/geometry.ts (+ vitest): world<->screen and object-local<->world
  transforms, clampScale, zoomViewportAt (the wheel/pinch "keep the point
  under the cursor stationary" math), zoomToFitRect. 11 geometry tests
  (round-trips, rotation, cursor-anchored zoom, fit) + 6 units tests.
- editor/store.ts: Zustand store for ephemeral editor state — viewport,
  selection, focusedObjectId (selection interactions grow in #11).
- editor/useViewport.ts: @use-gesture wiring — wheel + pinch zoom toward
  the pointer, drag-pan, scale clamped to [0.05, 20] px/cm, and an animated
  fitToRect (eased rAF tween). touch-action:none so the browser doesn't
  fight gestures.
- editor/ObjectShape.tsx: rect/circle centered + rotated, kind default
  colors, name label; non-scaling strokes so outlines stay 1px at any zoom.
- editor/GardenCanvas.tsx: full-size svg, single world <g>, fading 1m grid,
  garden boundary, z-ordered objects; ResizeObserver-driven auto-fit, a
  zoom readout, and a Fit control. Deps: zustand, @use-gesture/react,
  vitest (+ test scripts).
- GardenEditorPage renders the canvas with a mock scene (#11 swaps in
  /full).

Verified in a real browser: wheel zoom keeps the world point under the
cursor stationary (sub-cm drift on a 12m garden), a real drag pans, and
Fit animates to frame the garden. tsc + vitest green.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01JdQpdYYsTgtkJBxbcpAszi

web/package-lock.json

@@ -10,11 +10,13 @@
       "dependencies": {
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         "@tanstack/react-router": "^1.95.0",
+        "@use-gesture/react": "^10.3.1",
         "clsx": "^2.1.1",
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
         "tailwind-merge": "^2.6.0",
-        "zod": "^3.24.1"
+        "zod": "^3.24.1",
+        "zustand": "^5.0.14"
       },
       "devDependencies": {
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@@ -24,7 +26,8 @@
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         "tailwindcss": "^4.0.0",
         "typescript": "^5.7.2",
-        "vite": "^6.0.7"
+        "vite": "^6.0.7",
+        "vitest": "^4.1.10"
       },
       "engines": {
         "node": ">=20"
@@ -1200,6 +1203,13 @@
         "win32"
       ]
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+    "node_modules/@standard-schema/spec": {
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@@ -1638,6 +1648,24 @@
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/deep-eql": "*",
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+    "node_modules/@types/deep-eql": {
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+      "resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",
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-      "dev": true,
+      "devOptional": true,
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@@ -1675,6 +1703,24 @@
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       }
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+      "resolved": "https://registry.npmjs.org/@use-gesture/core/-/core-10.3.1.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/@use-gesture/react": {
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+      "resolved": "https://registry.npmjs.org/@use-gesture/react/-/react-10.3.1.tgz",
+      "integrity": "sha512-Yy19y6O2GJq8f7CHf7L0nxL8bf4PZCPaVOCgJrusOeFHY1LvHgYXnmnXg6N5iwAnbgbZCDjo60SiM6IPJi9C5g==",
+      "license": "MIT",
+      "dependencies": {
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+      },
+      "peerDependencies": {
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@@ -1696,6 +1742,129 @@
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       }
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+      "license": "MIT",
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+        "@types/chai": "^5.2.2",
+        "@vitest/spy": "4.1.10",
+        "@vitest/utils": "4.1.10",
+        "chai": "^6.2.2",
+        "tinyrainbow": "^3.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/@vitest/mocker": {
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+      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-4.1.10.tgz",
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+        "estree-walker": "^3.0.3",
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+      "peerDependenciesMeta": {
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+        "vite": {
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+        "@vitest/utils": "4.1.10",
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+      "resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-4.1.10.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "convert-source-map": "^2.0.0",
+        "tinyrainbow": "^3.1.0"
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+      "funding": {
+        "url": "https://opencollective.com/vitest"
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+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz",
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+      "dev": true,
+      "license": "MIT",
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@@ -1764,6 +1933,16 @@
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+      "resolved": "https://registry.npmjs.org/chai/-/chai-6.2.2.tgz",
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+      "dev": true,
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-      "dev": true,
+      "devOptional": true,
       "license": "MIT"
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@@ -1842,6 +2021,13 @@
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+      "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-2.3.1.tgz",
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@@ -1894,6 +2080,26 @@
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+      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-3.0.3.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/estree": "^1.0.0"
+      }
+    },
+    "node_modules/expect-type": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/expect-type/-/expect-type-1.4.0.tgz",
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@@ -2325,6 +2531,27 @@
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+      "resolved": "https://registry.npmjs.org/obug/-/obug-2.1.4.tgz",
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+      "dev": true,
+      "funding": [
+        "https://github.com/sponsors/sxzz",
+        "https://opencollective.com/debug"
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.20.0"
+      }
+    },
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+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/pathe/-/pathe-2.0.3.tgz",
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+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/picocolors": {
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@@ -2487,6 +2714,13 @@
         "seroval": "^1.0"
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@@ -2497,6 +2731,20 @@
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+      "license": "MIT"
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@@ -2528,6 +2776,23 @@
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+    "node_modules/tinybench": {
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@@ -2545,6 +2810,16 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
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@@ -2681,6 +2956,113 @@
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+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.1.10",
+        "@vitest/browser-preview": "4.1.10",
+        "@vitest/browser-webdriverio": "4.1.10",
+        "@vitest/coverage-istanbul": "4.1.10",
+        "@vitest/coverage-v8": "4.1.10",
+        "@vitest/ui": "4.1.10",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
@@ -2696,6 +3078,35 @@
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
+    },
+    "node_modules/zustand": {
+      "version": "5.0.14",
+      "resolved": "https://registry.npmjs.org/zustand/-/zustand-5.0.14.tgz",
+      "integrity": "sha512-/8tAspM5LMPr28b3fwLYrtdj77ECpfZviaP75CMTnwO8ISyaE4GDIG/9rDDYq/cH9D2Xw2A2RXglLInmVBQB/g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.20.0"
+      },
+      "peerDependencies": {
+        "@types/react": ">=18.0.0",
+        "immer": ">=9.0.6",
+        "react": ">=18.0.0",
+        "use-sync-external-store": ">=1.2.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "immer": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "use-sync-external-store": {
+          "optional": true
+        }
+      }
     }
   }
 }