Add side panels, task selection, graph animation, and project docs

- Foldable left panel (user profile) and right panel (task details)
- Clicking a task in the list or graph node selects it and shows details
- Both views (task list + graph) always mounted via absolute inset-0 for
  correct canvas dimensions; tabs toggle visibility with opacity
- Graph node selection animation: other nodes repel outward (charge -600),
  then selected node smoothly slides to center (500ms cubic ease-out),
  then charge restores to -120 and graph stabilizes
- Graph re-fits on tab switch and panel resize via ResizeObserver
- Fix UUID string IDs throughout (backend returns UUIDs, not integers)
- Add TaskDetailPanel, UserPanel components
- Add CLAUDE.md project documentation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/whatwg-encoding/README.md

@@ -0,0 +1,50 @@
+# Decode According to the WHATWG Encoding Standard
+
+This package provides a thin layer on top of [iconv-lite](https://github.com/ashtuchkin/iconv-lite) which makes it expose some of the same primitives as the [Encoding Standard](https://encoding.spec.whatwg.org/).
+
+```js
+const whatwgEncoding = require("whatwg-encoding");
+
+console.assert(whatwgEncoding.labelToName("latin1") === "windows-1252");
+console.assert(whatwgEncoding.labelToName("  CYRILLic ") === "ISO-8859-5");
+
+console.assert(whatwgEncoding.isSupported("IBM866") === true);
+
+// Not supported by the Encoding Standard
+console.assert(whatwgEncoding.isSupported("UTF-32") === false);
+
+// In the Encoding Standard, but this package can't decode it
+console.assert(whatwgEncoding.isSupported("x-mac-cyrillic") === false);
+
+console.assert(whatwgEncoding.getBOMEncoding(new Uint8Array([0xFE, 0xFF])) === "UTF-16BE");
+console.assert(whatwgEncoding.getBOMEncoding(new Uint8Array([0x48, 0x69])) === null);
+
+console.assert(whatwgEncoding.decode(new Uint8Array([0x48, 0x69]), "UTF-8") === "Hi");
+```
+
+## API
+
+- `decode(uint8Array, fallbackEncodingName)`: performs the [decode](https://encoding.spec.whatwg.org/#decode) algorithm (in which any BOM will override the passed fallback encoding), and returns the resulting string
+- `labelToName(label)`: performs the [get an encoding](https://encoding.spec.whatwg.org/#concept-encoding-get) algorithm and returns the resulting encoding's name, or `null` for failure
+- `isSupported(name)`: returns whether the encoding is one of [the encodings](https://encoding.spec.whatwg.org/#names-and-labels) of the Encoding Standard, _and_ is an encoding that this package can decode (via iconv-lite)
+- `getBOMEncoding(uint8Array)`: sniffs the first 2–3 bytes of the supplied `Uint8Array`, returning one of the encoding names `"UTF-8"`, `"UTF-16LE"`, or `"UTF-16BE"` if the appropriate BOM is present, or `null` if no BOM is present
+
+## Unsupported encodings
+
+Since we rely on iconv-lite, we are limited to support only the encodings that they support. Currently we are missing support for:
+
+- ISO-2022-JP
+- ISO-8859-8-I
+- replacement
+- x-mac-cyrillic
+- x-user-defined
+
+Passing these encoding names will return `false` when calling `isSupported`, and passing any of the possible labels for these encodings to `labelToName` will return `null`.
+
+## Credits
+
+This package was originally based on the excellent work of [@nicolashenry](https://github.com/nicolashenry), [in jsdom](https://github.com/tmpvar/jsdom/blob/7ce11776ce161e8d5921a7a183585327400f786b/lib/jsdom/living/helpers/encoding.js). It has since been pulled out into this separate package.
+
+## Alternatives
+
+If you are looking for a JavaScript implementation of the Encoding Standard's `TextEncoder` and `TextDecoder` APIs, you'll want [@inexorabletash](https://github.com/inexorabletash)'s [text-encoding](https://github.com/inexorabletash/text-encoding) package. Node.js also has them [built-in](https://nodejs.org/dist/latest/docs/api/globals.html#globals_textdecoder).