feat(i18n): scaffold svelte-i18n with en/es/de locales and language selector

initI18n (src/lib/i18n/index.ts) registers three locales and picks the
initial one in order: kon_locale in localStorage > navigator.language short
code > en. +layout.svelte calls it once at app boot; guarded so per-window
re-init is a no-op.

Locale files are deliberately sparse — this is a scaffolding pass so strings
can be migrated incrementally. The Settings → Appearance → Language picker
plus its own description is the first real consumer; everything else
continues to render as hardcoded text until extracted.

Also: split the @chenglou/pretext ambient shim into src/lib/shims.d.ts. The
declaration previously lived in app.d.ts alongside a top-level `export {}`,
which made app.d.ts a module — scoping `declare module` to its own imports
and breaking resolution from src/lib/utils/textMeasure.ts. The fresh
.svelte-kit sync triggered by installing svelte-i18n surfaced it. Ambient
shim files must stay script-scoped (no top-level imports/exports).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package-lock.json

@@ -13,7 +13,8 @@
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         "@tauri-apps/plugin-global-shortcut": "^2.3.1",
         "@tauri-apps/plugin-opener": "^2",
-        "lucide-svelte": "^0.577.0"
+        "lucide-svelte": "^0.577.0",
+        "svelte-i18n": "^4.0.1"
       },
       "devDependencies": {
         "@sveltejs/adapter-static": "^3.0.6",
@@ -470,6 +471,57 @@
         "node": ">=18"
       }
     },
+    "node_modules/@formatjs/ecma402-abstract": {
+      "version": "2.3.6",
+      "resolved": "https://registry.npmjs.org/@formatjs/ecma402-abstract/-/ecma402-abstract-2.3.6.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/fast-memoize": "2.2.7",
+        "@formatjs/intl-localematcher": "0.6.2",
+        "decimal.js": "^10.4.3",
+        "tslib": "^2.8.0"
+      }
+    },
+    "node_modules/@formatjs/fast-memoize": {
+      "version": "2.2.7",
+      "resolved": "https://registry.npmjs.org/@formatjs/fast-memoize/-/fast-memoize-2.2.7.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.8.0"
+      }
+    },
+    "node_modules/@formatjs/icu-messageformat-parser": {
+      "version": "2.11.4",
+      "resolved": "https://registry.npmjs.org/@formatjs/icu-messageformat-parser/-/icu-messageformat-parser-2.11.4.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "@formatjs/icu-skeleton-parser": "1.8.16",
+        "tslib": "^2.8.0"
+      }
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+    "node_modules/@formatjs/icu-skeleton-parser": {
+      "version": "1.8.16",
+      "resolved": "https://registry.npmjs.org/@formatjs/icu-skeleton-parser/-/icu-skeleton-parser-1.8.16.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "tslib": "^2.8.0"
+      }
+    },
+    "node_modules/@formatjs/intl-localematcher": {
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+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.6.2.tgz",
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+      "license": "MIT",
+      "dependencies": {
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@@ -1650,6 +1702,22 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "node_modules/cli-color": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/cli-color/-/cli-color-2.0.4.tgz",
+      "integrity": "sha512-zlnpg0jNcibNrO7GG9IeHH7maWFeCz+Ja1wx/7tZNU5ASSSSZ+/qZciM0/LHCYxSdqv5h2sdbQ/PXYdOuetXvA==",
+      "license": "ISC",
+      "dependencies": {
+        "d": "^1.0.1",
+        "es5-ext": "^0.10.64",
+        "es6-iterator": "^2.0.3",
+        "memoizee": "^0.4.15",
+        "timers-ext": "^0.1.7"
+      },
+      "engines": {
+        "node": ">=0.10"
+      }
+    },
     "node_modules/clsx": {
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       "resolved": "https://registry.npmjs.org/clsx/-/clsx-2.1.1.tgz",
@@ -1669,6 +1737,19 @@
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       }
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+      "resolved": "https://registry.npmjs.org/d/-/d-1.0.2.tgz",
+      "integrity": "sha512-MOqHvMWF9/9MX6nza0KgvFH4HpMU0EF5uUDXqX/BtxtU8NfB0QzRtJ8Oe/6SuS4kbhyzVJwjd97EA4PKrzJ8bw==",
+      "license": "ISC",
+      "dependencies": {
+        "es5-ext": "^0.10.64",
+        "type": "^2.7.2"
+      },
+      "engines": {
+        "node": ">=0.12"
+      }
+    },
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       "version": "4.4.3",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
@@ -1687,11 +1768,16 @@
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       }
     },
+    "node_modules/decimal.js": {
+      "version": "10.6.0",
+      "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.6.0.tgz",
+      "integrity": "sha512-YpgQiITW3JXGntzdUmyUR1V812Hn8T1YVXhCu+wO3OpS4eU9l4YdD3qjyiKdV6mvV29zapkMeD390UVEf2lkUg==",
+      "license": "MIT"
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-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.10.0"
@@ -1727,6 +1813,58 @@
         "node": ">=10.13.0"
       }
     },
+    "node_modules/es5-ext": {
+      "version": "0.10.64",
+      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.64.tgz",
+      "integrity": "sha512-p2snDhiLaXe6dahss1LddxqEm+SkuDvV8dnIQG0MWjyHpcMNfXKPE+/Cc0y+PhxJX3A4xGNeFCj5oc0BUh6deg==",
+      "hasInstallScript": true,
+      "license": "ISC",
+      "dependencies": {
+        "es6-iterator": "^2.0.3",
+        "es6-symbol": "^3.1.3",
+        "esniff": "^2.0.1",
+        "next-tick": "^1.1.0"
+      },
+      "engines": {
+        "node": ">=0.10"
+      }
+    },
+    "node_modules/es6-iterator": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/es6-iterator/-/es6-iterator-2.0.3.tgz",
+      "integrity": "sha512-zw4SRzoUkd+cl+ZoE15A9o1oQd920Bb0iOJMQkQhl3jNc03YqVjAhG7scf9C5KWRU/R13Orf588uCC6525o02g==",
+      "license": "MIT",
+      "dependencies": {
+        "d": "1",
+        "es5-ext": "^0.10.35",
+        "es6-symbol": "^3.1.1"
+      }
+    },
+    "node_modules/es6-symbol": {
+      "version": "3.1.4",
+      "resolved": "https://registry.npmjs.org/es6-symbol/-/es6-symbol-3.1.4.tgz",
+      "integrity": "sha512-U9bFFjX8tFiATgtkJ1zg25+KviIXpgRvRHS8sau3GfhVzThRQrOeksPeT0BWW2MNZs1OEWJ1DPXOQMn0KKRkvg==",
+      "license": "ISC",
+      "dependencies": {
+        "d": "^1.0.2",
+        "ext": "^1.7.0"
+      },
+      "engines": {
+        "node": ">=0.12"
+      }
+    },
+    "node_modules/es6-weak-map": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/es6-weak-map/-/es6-weak-map-2.0.3.tgz",
+      "integrity": "sha512-p5um32HOTO1kP+w7PRnB+5lQ43Z6muuMuIMffvDN8ZB4GcnjLBV6zGStpbASIMk4DCAvEaamhe2zhyCb/QXXsA==",
+      "license": "ISC",
+      "dependencies": {
+        "d": "1",
+        "es5-ext": "^0.10.46",
+        "es6-iterator": "^2.0.3",
+        "es6-symbol": "^3.1.1"
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@@ -1775,6 +1913,21 @@
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       "license": "MIT"
     },
+    "node_modules/esniff": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/esniff/-/esniff-2.0.1.tgz",
+      "integrity": "sha512-kTUIGKQ/mDPFoJ0oVfcmyJn4iBDRptjNVIzwIFR7tqWXdVI9xfA2RMwY/gbSpJG3lkdWNEjLap/NqVHZiJsdfg==",
+      "license": "ISC",
+      "dependencies": {
+        "d": "^1.0.1",
+        "es5-ext": "^0.10.62",
+        "event-emitter": "^0.3.5",
+        "type": "^2.7.2"
+      },
+      "engines": {
+        "node": ">=0.10"
+      }
+    },
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@@ -1785,6 +1938,31 @@
         "@typescript-eslint/types": "^8.2.0"
       }
     },
+    "node_modules/estree-walker": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-2.0.2.tgz",
+      "integrity": "sha512-Rfkk/Mp/DL7JVje3u18FxFujQlTNR2q6QfMSMB7AvCBx91NGj/ba3kCfza0f6dVDbw7YlRf/nDrn7pQrCCyQ/w==",
+      "license": "MIT"
+    },
+    "node_modules/event-emitter": {
+      "version": "0.3.5",
+      "resolved": "https://registry.npmjs.org/event-emitter/-/event-emitter-0.3.5.tgz",
+      "integrity": "sha512-D9rRn9y7kLPnJ+hMq7S/nhvoKwwvVJahBi2BPmx3bvbsEdK3W9ii8cBSGjP+72/LnM4n6fo3+dkCX5FeTQruXA==",
+      "license": "MIT",
+      "dependencies": {
+        "d": "1",
+        "es5-ext": "~0.10.14"
+      }
+    },
+    "node_modules/ext": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/ext/-/ext-1.7.0.tgz",
+      "integrity": "sha512-6hxeJYaL110a9b5TEJSj0gojyHQAmA2ch5Os+ySCiA1QGdS697XWY1pzsrSjqA9LDEEgdB/KypIlR59RcLuHYw==",
+      "license": "ISC",
+      "dependencies": {
+        "type": "^2.7.2"
+      }
+    },
     "node_modules/fdir": {
       "version": "6.5.0",
       "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
@@ -1818,6 +1996,18 @@
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
     },
+    "node_modules/globalyzer": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/globalyzer/-/globalyzer-0.1.0.tgz",
+      "integrity": "sha512-40oNTM9UfG6aBmuKxk/giHn5nQ8RVz/SS4Ir6zgzOv9/qC3kKZ9v4etGTcJbEl/NyVQH7FGU7d+X1egr57Md2Q==",
+      "license": "MIT"
+    },
+    "node_modules/globrex": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/globrex/-/globrex-0.1.2.tgz",
+      "integrity": "sha512-uHJgbwAMwNFf5mLst7IWLNg14x1CkeqglJb/K3doi4dw6q2IvAAmM/Y81kevy83wP+Sst+nutFTYOGg3d1lsxg==",
+      "license": "MIT"
+    },
     "node_modules/graceful-fs": {
       "version": "4.2.11",
       "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.11.tgz",
@@ -1825,6 +2015,24 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/intl-messageformat": {
+      "version": "10.7.18",
+      "resolved": "https://registry.npmjs.org/intl-messageformat/-/intl-messageformat-10.7.18.tgz",
+      "integrity": "sha512-m3Ofv/X/tV8Y3tHXLohcuVuhWKo7BBq62cqY15etqmLxg2DZ34AGGgQDeR+SCta2+zICb1NX83af0GJmbQ1++g==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@formatjs/ecma402-abstract": "2.3.6",
+        "@formatjs/fast-memoize": "2.2.7",
+        "@formatjs/icu-messageformat-parser": "2.11.4",
+        "tslib": "^2.8.0"
+      }
+    },
+    "node_modules/is-promise": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/is-promise/-/is-promise-2.2.2.tgz",
+      "integrity": "sha512-+lP4/6lKUBfQjZ2pdxThZvLUAafmZb8OAxFb8XXtiQmS35INgr85hdOGoEs124ez1FCnZJt6jau/T+alh58QFQ==",
+      "license": "MIT"
+    },
     "node_modules/is-reference": {
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       "license": "MIT"
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+    "node_modules/lru-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/lru-queue/-/lru-queue-0.1.0.tgz",
+      "integrity": "sha512-BpdYkt9EvGl8OfWHDQPISVpcl5xZthb+XPsbELj5AQXxIC8IriDZIQYjBJPEm5rS420sjZ0TLEzRcq5KdBhYrQ==",
+      "license": "MIT",
+      "dependencies": {
+        "es5-ext": "~0.10.2"
+      }
+    },
     "node_modules/lucide-svelte": {
       "version": "0.577.0",
       "resolved": "https://registry.npmjs.org/lucide-svelte/-/lucide-svelte-0.577.0.tgz",
@@ -2151,11 +2368,29 @@
         "@jridgewell/sourcemap-codec": "^1.5.5"
       }
     },
+    "node_modules/memoizee": {
+      "version": "0.4.17",
+      "resolved": "https://registry.npmjs.org/memoizee/-/memoizee-0.4.17.tgz",
+      "integrity": "sha512-DGqD7Hjpi/1or4F/aYAspXKNm5Yili0QDAFAY4QYvpqpgiY6+1jOfqpmByzjxbWd/T9mChbCArXAbDAsTm5oXA==",
+      "license": "ISC",
+      "dependencies": {
+        "d": "^1.0.2",
+        "es5-ext": "^0.10.64",
+        "es6-weak-map": "^2.0.3",
+        "event-emitter": "^0.3.5",
+        "is-promise": "^2.2.2",
+        "lru-queue": "^0.1.0",
+        "next-tick": "^1.1.0",
+        "timers-ext": "^0.1.7"
+      },
+      "engines": {
+        "node": ">=0.12"
+      }
+    },
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-      "dev": true,
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@@ -2197,6 +2432,12 @@
         "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
       }
     },
+    "node_modules/next-tick": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/next-tick/-/next-tick-1.1.0.tgz",
+      "integrity": "sha512-CXdUiJembsNjuToQvxayPZF9Vqht7hewsvy2sOWafLvi2awflj9mOC6bHIg50orX8IJvWKY9wYQ/zB2kogPslQ==",
+      "license": "ISC"
+    },
     "node_modules/picocolors": {
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       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
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@@ -2401,6 +2641,436 @@
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       }
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+    "node_modules/svelte-i18n": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/svelte-i18n/-/svelte-i18n-4.0.1.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "cli-color": "^2.0.3",
+        "deepmerge": "^4.2.2",
+        "esbuild": "^0.19.2",
+        "estree-walker": "^2",
+        "intl-messageformat": "^10.5.3",
+        "sade": "^1.8.1",
+        "tiny-glob": "^0.2.9"
+      },
+      "bin": {
+        "svelte-i18n": "dist/cli.js"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "peerDependencies": {
+        "svelte": "^3 || ^4 || ^5"
+      }
+    },
+    "node_modules/svelte-i18n/node_modules/@esbuild/aix-ppc64": {
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+      "cpu": [
+        "ppc64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/svelte-i18n/node_modules/@esbuild/android-arm": {
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+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.19.12.tgz",
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+      "cpu": [
+        "arm"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=12"
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+    },
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+      "cpu": [
+        "arm64"
+      ],
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+      ],
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+      ],
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+      }
+    },
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+      ],
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+      }
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+      ],
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+      ],
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+      }
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+      ],
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+      }
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+      ],
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+      ],
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+      }
+    },
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+      "cpu": [
+        "s390x"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
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+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
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+        "node": ">=12"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.19.12.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "netbsd"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/svelte-i18n/node_modules/@esbuild/openbsd-x64": {
+      "version": "0.19.12",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.19.12.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openbsd"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/svelte-i18n/node_modules/@esbuild/sunos-x64": {
+      "version": "0.19.12",
+      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.19.12.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "sunos"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/svelte-i18n/node_modules/@esbuild/win32-arm64": {
+      "version": "0.19.12",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.19.12.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/svelte-i18n/node_modules/@esbuild/win32-ia32": {
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+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.19.12.tgz",
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+      "cpu": [
+        "ia32"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/svelte-i18n/node_modules/@esbuild/win32-x64": {
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+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.19.12.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/svelte-i18n/node_modules/esbuild": {
+      "version": "0.19.12",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.19.12.tgz",
+      "integrity": "sha512-aARqgq8roFBj054KvQr5f1sFu0D65G+miZRCuJyJ0G13Zwx7vRar5Zhn2tkQNzIXcBrNVsv/8stehpj+GAjgbg==",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "bin": {
+        "esbuild": "bin/esbuild"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "optionalDependencies": {
+        "@esbuild/aix-ppc64": "0.19.12",
+        "@esbuild/android-arm": "0.19.12",
+        "@esbuild/android-arm64": "0.19.12",
+        "@esbuild/android-x64": "0.19.12",
+        "@esbuild/darwin-arm64": "0.19.12",
+        "@esbuild/darwin-x64": "0.19.12",
+        "@esbuild/freebsd-arm64": "0.19.12",
+        "@esbuild/freebsd-x64": "0.19.12",
+        "@esbuild/linux-arm": "0.19.12",
+        "@esbuild/linux-arm64": "0.19.12",
+        "@esbuild/linux-ia32": "0.19.12",
+        "@esbuild/linux-loong64": "0.19.12",
+        "@esbuild/linux-mips64el": "0.19.12",
+        "@esbuild/linux-ppc64": "0.19.12",
+        "@esbuild/linux-riscv64": "0.19.12",
+        "@esbuild/linux-s390x": "0.19.12",
+        "@esbuild/linux-x64": "0.19.12",
+        "@esbuild/netbsd-x64": "0.19.12",
+        "@esbuild/openbsd-x64": "0.19.12",
+        "@esbuild/sunos-x64": "0.19.12",
+        "@esbuild/win32-arm64": "0.19.12",
+        "@esbuild/win32-ia32": "0.19.12",
+        "@esbuild/win32-x64": "0.19.12"
+      }
+    },
     "node_modules/tailwindcss": {
       "version": "4.2.1",
       "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.2.1.tgz",
@@ -2422,6 +3092,29 @@
         "url": "https://opencollective.com/webpack"
       }
     },
+    "node_modules/timers-ext": {
+      "version": "0.1.8",
+      "resolved": "https://registry.npmjs.org/timers-ext/-/timers-ext-0.1.8.tgz",
+      "integrity": "sha512-wFH7+SEAcKfJpfLPkrgMPvvwnEtj8W4IurvEyrKsDleXnKLCDw71w8jltvfLa8Rm4qQxxT4jmDBYbJG/z7qoww==",
+      "license": "ISC",
+      "dependencies": {
+        "es5-ext": "^0.10.64",
+        "next-tick": "^1.1.0"
+      },
+      "engines": {
+        "node": ">=0.12"
+      }
+    },
+    "node_modules/tiny-glob": {
+      "version": "0.2.9",
+      "resolved": "https://registry.npmjs.org/tiny-glob/-/tiny-glob-0.2.9.tgz",
+      "integrity": "sha512-g/55ssRPUjShh+xkfx9UPDXqhckHEsHr4Vd9zX55oSdGZc/MD0m3sferOkwWtp98bv+kcVfEHtRJgBVJzelrzg==",
+      "license": "MIT",
+      "dependencies": {
+        "globalyzer": "0.1.0",
+        "globrex": "^0.1.2"
+      }
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.15",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",
@@ -2449,6 +3142,18 @@
         "node": ">=6"
       }
     },
+    "node_modules/tslib": {
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+      "license": "0BSD"
+    },
+    "node_modules/type": {
+      "version": "2.7.3",
+      "resolved": "https://registry.npmjs.org/type/-/type-2.7.3.tgz",
+      "integrity": "sha512-8j+1QmAbPvLZow5Qpi6NCaN8FB60p/6x8/vfNqOk/hC+HuvFZhL4+WfekuhQLiqFZXOgQdrs3B+XxEmCc6b3FQ==",
+      "license": "ISC"
+    },
     "node_modules/typescript": {
       "version": "5.6.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.6.3.tgz",

package.json

@@ -18,7 +18,8 @@
     "@tauri-apps/plugin-dialog": "^2.6.0",
     "@tauri-apps/plugin-global-shortcut": "^2.3.1",
     "@tauri-apps/plugin-opener": "^2",
-    "lucide-svelte": "^0.577.0"
+    "lucide-svelte": "^0.577.0",
+    "svelte-i18n": "^4.0.1"
   },
   "devDependencies": {
     "@sveltejs/adapter-static": "^3.0.6",

src/app.d.ts

@@ -5,40 +5,4 @@ declare global {
   }
 }
 
-declare module "@chenglou/pretext" {
-  export interface PretextLayoutLine {
-    text: string;
-  }
-
-  export interface PretextLayoutResult {
-    height: number;
-    lineCount: number;
-    lines: PretextLayoutLine[];
-  }
-
-  export function prepare(
-    text: string,
-    font: string,
-    options?: Record<string, unknown>,
-  ): unknown;
-
-  export function prepareWithSegments(
-    text: string,
-    font: string,
-    options?: Record<string, unknown>,
-  ): unknown;
-
-  export function layout(
-    prepared: unknown,
-    maxWidth: number,
-    lineHeight: number,
-  ): PretextLayoutResult;
-
-  export function layoutWithLines(
-    prepared: unknown,
-    maxWidth: number,
-    lineHeight: number,
-  ): PretextLayoutResult;
-}
-
 export {};

src/lib/i18n/index.ts

@@ -0,0 +1,73 @@
+//! i18n scaffolding via svelte-i18n.
+//!
+//! Scope for the initial pass: wire the stack (loader, persisted choice,
+//! Settings selector) so strings can be migrated incrementally. Only a
+//! handful of labels are actually translated today — everything else
+//! continues to render as-is via hardcoded text until extracted.
+//!
+//! Locales currently shipped: en (source of truth), es, de. Adding a new
+//! locale is one `register` call + a new `locales/<code>.json`.
+
+import { init, register, locale as svelteLocale } from "svelte-i18n";
+import { derived, get } from "svelte/store";
+
+export type Locale = "en" | "es" | "de";
+
+export const SUPPORTED_LOCALES: { code: Locale; label: string }[] = [
+  { code: "en", label: "English" },
+  { code: "es", label: "Español" },
+  { code: "de", label: "Deutsch" },
+];
+
+const STORAGE_KEY = "kon_locale";
+
+register("en", () => import("./locales/en.json"));
+register("es", () => import("./locales/es.json"));
+register("de", () => import("./locales/de.json"));
+
+function detectInitialLocale(): Locale {
+  if (typeof localStorage !== "undefined") {
+    const stored = localStorage.getItem(STORAGE_KEY);
+    if (stored && SUPPORTED_LOCALES.some((option) => option.code === stored)) {
+      return stored as Locale;
+    }
+  }
+  if (typeof navigator !== "undefined" && navigator.language) {
+    const short = navigator.language.split("-")[0] as Locale;
+    if (SUPPORTED_LOCALES.some((option) => option.code === short)) {
+      return short;
+    }
+  }
+  return "en";
+}
+
+let initialised = false;
+
+export function initI18n(): void {
+  if (initialised) return;
+  initialised = true;
+
+  init({
+    fallbackLocale: "en",
+    initialLocale: detectInitialLocale(),
+  });
+}
+
+export function setLocale(code: Locale): void {
+  svelteLocale.set(code);
+  if (typeof localStorage !== "undefined") {
+    try {
+      localStorage.setItem(STORAGE_KEY, code);
+    } catch {
+      // non-fatal: private browsing, quota, etc.
+    }
+  }
+}
+
+export const currentLocale = derived(svelteLocale, ($locale) =>
+  ((($locale ?? "en").split("-")[0]) as Locale),
+);
+
+export function getCurrentLocale(): Locale {
+  return get(currentLocale);
+}

src/lib/i18n/locales/de.json

@@ -0,0 +1,19 @@
+{
+  "settings": {
+    "title": "Einstellungen",
+    "language": "Sprache",
+    "languageDescription": "Oberflächensprache von Kon. Wirkt sich nicht auf die Transkription aus."
+  },
+  "history": {
+    "title": "Verlauf",
+    "empty": "Noch keine Transkripte — drück das Kürzel und leg los."
+  },
+  "tasks": {
+    "title": "Aufgaben"
+  },
+  "dictation": {
+    "ready": "Bereit",
+    "recording": "Aufnahme…",
+    "processing": "Verarbeitung…"
+  }
+}

src/lib/i18n/locales/en.json

@@ -0,0 +1,19 @@
+{
+  "settings": {
+    "title": "Settings",
+    "language": "Language",
+    "languageDescription": "Kon's interface language. Affects labels, not transcription."
+  },
+  "history": {
+    "title": "History",
+    "empty": "No transcripts yet — press the hotkey and start talking."
+  },
+  "tasks": {
+    "title": "Tasks"
+  },
+  "dictation": {
+    "ready": "Ready",
+    "recording": "Recording…",
+    "processing": "Processing…"
+  }
+}

src/lib/i18n/locales/es.json

@@ -0,0 +1,19 @@
+{
+  "settings": {
+    "title": "Ajustes",
+    "language": "Idioma",
+    "languageDescription": "Idioma de la interfaz de Kon. No afecta a la transcripción."
+  },
+  "history": {
+    "title": "Historial",
+    "empty": "Sin transcripciones todavía — pulsa el atajo y empieza a hablar."
+  },
+  "tasks": {
+    "title": "Tareas"
+  },
+  "dictation": {
+    "ready": "Listo",
+    "recording": "Grabando…",
+    "processing": "Procesando…"
+  }
+}

src/lib/pages/SettingsPage.svelte

@@ -15,6 +15,8 @@
   import { clampTextLines } from "$lib/utils/textMeasure.js";
   import { bodyPretextLineHeight, pretextFontShorthand } from "$lib/utils/accessibilityTypography.js";
   import { Check, ChevronRight } from "lucide-svelte";
+  import { _ } from "svelte-i18n";
+  import { SUPPORTED_LOCALES, setLocale, currentLocale } from "$lib/i18n";
 
   const prefs = getPreferences();
 
@@ -1603,6 +1605,25 @@
                 data-no-transition
               />
             </div>
+
+            <div class="mb-2">
+              <p class="text-[10px] font-medium text-text-tertiary uppercase tracking-wider mb-2">
+                {$_("settings.language")}
+              </p>
+              <div class="inline-flex bg-bg-elevated rounded-[10px] p-[3px] gap-[2px]">
+                {#each SUPPORTED_LOCALES as option}
+                  <button
+                    class="rounded-lg font-medium px-3.5 py-[6px] text-[12px]
+                      {$currentLocale === option.code
+                        ? 'bg-accent text-bg shadow-[0_1px_4px_rgba(232,168,124,0.3)]'
+                        : 'text-text-secondary hover:text-text hover:bg-hover'}"
+                    style="transition-duration: var(--duration-ui)"
+                    onclick={() => setLocale(option.code)}
+                  >{option.label}</button>
+                {/each}
+              </div>
+              <p class="text-[11px] text-text-tertiary mt-2">{$_("settings.languageDescription")}</p>
+            </div>
           </div>
         {/if}
       </div>

src/lib/shims.d.ts

@@ -0,0 +1,39 @@
+// Ambient module shims. Must stay script-scoped (no top-level imports /
+// exports) so `declare module` registers globally; adding an import/export
+// turns the file into a module and scopes the declaration away.
+
+declare module "@chenglou/pretext" {
+  export interface PretextLayoutLine {
+    text: string;
+  }
+
+  export interface PretextLayoutResult {
+    height: number;
+    lineCount: number;
+    lines: PretextLayoutLine[];
+  }
+
+  export function prepare(
+    text: string,
+    font: string,
+    options?: Record<string, unknown>,
+  ): unknown;
+
+  export function prepareWithSegments(
+    text: string,
+    font: string,
+    options?: Record<string, unknown>,
+  ): unknown;
+
+  export function layout(
+    prepared: unknown,
+    maxWidth: number,
+    lineHeight: number,
+  ): PretextLayoutResult;
+
+  export function layoutWithLines(
+    prepared: unknown,
+    maxWidth: number,
+    lineHeight: number,
+  ): PretextLayoutResult;
+}

src/routes/+layout.svelte

@@ -21,9 +21,14 @@
   import { getCurrentWindow } from "@tauri-apps/api/window";
   import { listen } from "@tauri-apps/api/event";
   import { toasts } from "$lib/stores/toasts.svelte.js";
+  import { initI18n } from "$lib/i18n";
 
   import { page as sveltePage } from "$app/stores";
 
+  // Set up svelte-i18n once per app instance. Safe to call from every
+  // window — initI18n guards itself against re-init.
+  initI18n();
+
   let { children } = $props();
 
   const prefs = getPreferences();