Set up comprehensive frontend testing infrastructure

- Install Jest for unit testing with React Testing Library
- Install Playwright for end-to-end testing
- Configure Jest with proper TypeScript support and module mapping
- Create test setup files and utilities for both unit and e2e tests

Components:
* Jest configuration with coverage thresholds
* Playwright configuration with browser automation
* Unit tests for LoginForm, AuthContext, and useSocketIO hook
* E2E tests for authentication, dashboard, and agents workflows
* GitHub Actions workflow for automated testing
* Mock data and API utilities for consistent testing
* Test documentation with best practices

Testing features:
- Unit tests with 70% coverage threshold
- E2E tests with API mocking and user journey testing
- CI/CD integration for automated test runs
- Cross-browser testing support with Playwright
- Authentication system testing end-to-end

🚀 Generated with [Claude Code](https://claude.ai/code)

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

frontend/node_modules/@csstools/css-tokenizer/dist/index.d.ts

@@ -0,0 +1,593 @@
+/**
+ * Tokenize CSS following the {@link https://drafts.csswg.org/css-syntax/#tokenization | CSS Syntax Level 3 specification}.
+ *
+ * @remarks
+ * The tokenizing and parsing tools provided by CSS Tools are designed to be low level and generic with strong ties to their respective specifications.
+ *
+ * Any analysis or mutation of CSS source code should be done with the least powerful tool that can accomplish the task.
+ * For many applications it is sufficient to work with tokens.
+ * For others you might need to use {@link https://github.com/csstools/postcss-plugins/tree/main/packages/css-parser-algorithms | @csstools/css-parser-algorithms} or a more specific parser.
+ *
+ * @example
+ * Tokenize a string of CSS into an array of tokens:
+ * ```js
+ * import { tokenize } from '@csstools/css-tokenizer';
+ *
+ * const myCSS = `@media only screen and (min-width: 768rem) {
+ * 	.foo {
+ * 		content: 'Some content!' !important;
+ * 	}
+ * }
+ * `;
+ *
+ * const tokens = tokenize({
+ * 	css: myCSS,
+ * });
+ *
+ * console.log(tokens);
+ * ```
+ *
+ * @packageDocumentation
+ */
+
+/**
+ * Deep clone a list of tokens.
+ * Useful for mutations without altering the original list.
+ */
+export declare function cloneTokens(tokens: Array<CSSToken>): Array<CSSToken>;
+
+/**
+ * The union of all possible CSS tokens
+ */
+export declare type CSSToken = TokenAtKeyword | TokenBadString | TokenBadURL | TokenCDC | TokenCDO | TokenColon | TokenComma | TokenComment | TokenDelim | TokenDimension | TokenEOF | TokenFunction | TokenHash | TokenIdent | TokenNumber | TokenPercentage | TokenSemicolon | TokenString | TokenURL | TokenWhitespace | TokenOpenParen | TokenCloseParen | TokenOpenSquare | TokenCloseSquare | TokenOpenCurly | TokenCloseCurly | TokenUnicodeRange;
+
+/**
+ * The type of hash token
+ */
+export declare enum HashType {
+    /**
+     * The hash token did not start with an ident sequence (e.g. `#-2`)
+     */
+    Unrestricted = "unrestricted",
+    /**
+     * The hash token started with an ident sequence (e.g. `#foo`)
+     * Only hash tokens with the "id" type are valid ID selectors.
+     */
+    ID = "id"
+}
+
+/**
+ * Assert that a given value has the general structure of a CSS token:
+ * 1. is an array.
+ * 2. has at least four items.
+ * 3. has a known token type.
+ * 4. has a string representation.
+ * 5. has a start position.
+ * 6. has an end position.
+ */
+export declare function isToken(x: any): x is CSSToken;
+
+export declare function isTokenAtKeyword(x?: CSSToken | null): x is TokenAtKeyword;
+
+export declare function isTokenBadString(x?: CSSToken | null): x is TokenBadString;
+
+export declare function isTokenBadURL(x?: CSSToken | null): x is TokenBadURL;
+
+export declare function isTokenCDC(x?: CSSToken | null): x is TokenCDC;
+
+export declare function isTokenCDO(x?: CSSToken | null): x is TokenCDO;
+
+export declare function isTokenCloseCurly(x?: CSSToken | null): x is TokenCloseCurly;
+
+export declare function isTokenCloseParen(x?: CSSToken | null): x is TokenCloseParen;
+
+export declare function isTokenCloseSquare(x?: CSSToken | null): x is TokenCloseSquare;
+
+export declare function isTokenColon(x?: CSSToken | null): x is TokenColon;
+
+export declare function isTokenComma(x?: CSSToken | null): x is TokenComma;
+
+export declare function isTokenComment(x?: CSSToken | null): x is TokenComment;
+
+export declare function isTokenDelim(x?: CSSToken | null): x is TokenDelim;
+
+export declare function isTokenDimension(x?: CSSToken | null): x is TokenDimension;
+
+export declare function isTokenEOF(x?: CSSToken | null): x is TokenEOF;
+
+export declare function isTokenFunction(x?: CSSToken | null): x is TokenFunction;
+
+export declare function isTokenHash(x?: CSSToken | null): x is TokenHash;
+
+export declare function isTokenIdent(x?: CSSToken | null): x is TokenIdent;
+
+export declare function isTokenNumber(x?: CSSToken | null): x is TokenNumber;
+
+/**
+ * Assert that a token is a numeric token
+ */
+export declare function isTokenNumeric(x?: CSSToken | null): x is NumericToken;
+
+export declare function isTokenOpenCurly(x?: CSSToken | null): x is TokenOpenCurly;
+
+export declare function isTokenOpenParen(x?: CSSToken | null): x is TokenOpenParen;
+
+export declare function isTokenOpenSquare(x?: CSSToken | null): x is TokenOpenSquare;
+
+export declare function isTokenPercentage(x?: CSSToken | null): x is TokenPercentage;
+
+export declare function isTokenSemicolon(x?: CSSToken | null): x is TokenSemicolon;
+
+export declare function isTokenString(x?: CSSToken | null): x is TokenString;
+
+export declare function isTokenUnicodeRange(x?: CSSToken | null): x is TokenUnicodeRange;
+
+export declare function isTokenURL(x?: CSSToken | null): x is TokenURL;
+
+export declare function isTokenWhitespace(x?: CSSToken | null): x is TokenWhitespace;
+
+/**
+ * Assert that a token is a whitespace or comment token
+ */
+export declare function isTokenWhiteSpaceOrComment(x?: CSSToken | null): x is TokenWhitespace | TokenComment;
+
+/**
+ * Get the mirror variant of a given token
+ *
+ * @example
+ *
+ * ```js
+ * const input = [TokenType.OpenParen, '(', 0, 1, undefined];
+ * const output = mirrorVariant(input);
+ *
+ * console.log(output); // [TokenType.CloseParen, ')', -1, -1, undefined]
+ * ```
+ */
+export declare function mirrorVariant(token: CSSToken): CSSToken | null;
+
+/**
+ * Get the mirror variant type of a given token type
+ *
+ * @example
+ *
+ * ```js
+ * const input = TokenType.OpenParen;
+ * const output = mirrorVariantType(input);
+ *
+ * console.log(output); // TokenType.CloseParen
+ * ```
+ */
+export declare function mirrorVariantType(type: TokenType): TokenType | null;
+
+/**
+ * Set the ident value and update the string representation.
+ * This handles escaping.
+ */
+export declare function mutateIdent(ident: TokenIdent, newValue: string): void;
+
+/**
+ * Set the unit and update the string representation.
+ * This handles escaping.
+ */
+export declare function mutateUnit(ident: TokenDimension, newUnit: string): void;
+
+/**
+ * The type of number token
+ * Either `integer` or `number`
+ */
+export declare enum NumberType {
+    Integer = "integer",
+    Number = "number"
+}
+
+/**
+ * The union of all possible CSS tokens that represent a numeric value
+ */
+export declare type NumericToken = TokenDimension | TokenNumber | TokenPercentage;
+
+/**
+ * The CSS Tokenizer is forgiving and will never throw on invalid input.
+ * Any errors are reported through the `onParseError` callback.
+ */
+export declare class ParseError extends Error {
+    /** The index of the start character of the current token. */
+    sourceStart: number;
+    /** The index of the end character of the current token. */
+    sourceEnd: number;
+    /** The parser steps that preceded the error. */
+    parserState: Array<string>;
+    constructor(message: string, sourceStart: number, sourceEnd: number, parserState: Array<string>);
+}
+
+export declare const ParseErrorMessage: {
+    UnexpectedNewLineInString: string;
+    UnexpectedEOFInString: string;
+    UnexpectedEOFInComment: string;
+    UnexpectedEOFInURL: string;
+    UnexpectedEOFInEscapedCodePoint: string;
+    UnexpectedCharacterInURL: string;
+    InvalidEscapeSequenceInURL: string;
+    InvalidEscapeSequenceAfterBackslash: string;
+};
+
+export declare class ParseErrorWithToken extends ParseError {
+    /** The associated token. */
+    token: CSSToken;
+    constructor(message: string, sourceStart: number, sourceEnd: number, parserState: Array<string>, token: CSSToken);
+}
+
+/**
+ * Concatenate the string representation of a list of tokens.
+ * This is not a proper serializer that will handle escaping and whitespace.
+ * It only produces valid CSS for a token list that is also valid.
+ */
+export declare function stringify(...tokens: Array<CSSToken>): string;
+
+/**
+ * The CSS Token interface
+ *
+ * @remarks
+ * CSS Tokens are fully typed and have a strict structure.
+ * This makes it easier to iterate and analyze a token stream.
+ *
+ * The string representation and the parsed value are stored separately for many token types.
+ * It is always assumed that the string representation will be used when stringifying, while the parsed value should be used when analyzing tokens.
+ */
+export declare interface Token<T extends TokenType, U> extends Array<T | string | number | U> {
+    /**
+     * The type of token
+     */
+    0: T;
+    /**
+     * The token representation
+     *
+     * @remarks
+     * This field will be used when stringifying the token.
+     * Any stored value is assumed to be valid CSS.
+     *
+     * You should never use this field when analyzing the token when there is a parsed value available.
+     * But you must store mutated values here.
+     */
+    1: string;
+    /**
+     * Start position of representation
+     */
+    2: number;
+    /**
+     * End position of representation
+     */
+    3: number;
+    /**
+     * Extra data
+     *
+     * @remarks
+     * This holds the parsed value of each token.
+     * These values are unescaped, unquoted, converted to numbers, etc.
+     *
+     * You should always use this field when analyzing the token.
+     * But you must not assume that mutating only this field will have any effect.
+     */
+    4: U;
+}
+
+export declare interface TokenAtKeyword extends Token<TokenType.AtKeyword, {
+    /**
+     * The unescaped at-keyword name without the leading `@`.
+     */
+    value: string;
+}> {
+}
+
+export declare interface TokenBadString extends Token<TokenType.BadString, undefined> {
+}
+
+export declare interface TokenBadURL extends Token<TokenType.BadURL, undefined> {
+}
+
+export declare interface TokenCDC extends Token<TokenType.CDC, undefined> {
+}
+
+export declare interface TokenCDO extends Token<TokenType.CDO, undefined> {
+}
+
+export declare interface TokenCloseCurly extends Token<TokenType.CloseCurly, undefined> {
+}
+
+export declare interface TokenCloseParen extends Token<TokenType.CloseParen, undefined> {
+}
+
+export declare interface TokenCloseSquare extends Token<TokenType.CloseSquare, undefined> {
+}
+
+export declare interface TokenColon extends Token<TokenType.Colon, undefined> {
+}
+
+export declare interface TokenComma extends Token<TokenType.Comma, undefined> {
+}
+
+export declare interface TokenComment extends Token<TokenType.Comment, undefined> {
+}
+
+export declare interface TokenDelim extends Token<TokenType.Delim, {
+    /**
+     * The delim character.
+     */
+    value: string;
+}> {
+}
+
+export declare interface TokenDimension extends Token<TokenType.Dimension, {
+    /**
+     * The numeric value.
+     */
+    value: number;
+    /**
+     * The unescaped unit name.
+     */
+    unit: string;
+    /**
+     * `integer` or `number`
+     */
+    type: NumberType;
+    /**
+     * The sign character as it appeared in the source.
+     * This is only useful if you need to determine if a value was written as "2px" or "+2px".
+     */
+    signCharacter?: '+' | '-';
+}> {
+}
+
+export declare interface TokenEOF extends Token<TokenType.EOF, undefined> {
+}
+
+export declare interface TokenFunction extends Token<TokenType.Function, {
+    /**
+     * The unescaped function name without the trailing `(`.
+     */
+    value: string;
+}> {
+}
+
+export declare interface TokenHash extends Token<TokenType.Hash, {
+    /**
+     * The unescaped hash value without the leading `#`.
+     */
+    value: string;
+    /**
+     * The hash type.
+     */
+    type: HashType;
+}> {
+}
+
+export declare interface TokenIdent extends Token<TokenType.Ident, {
+    /**
+     * The unescaped ident value.
+     */
+    value: string;
+}> {
+}
+
+/**
+ * Tokenize a CSS string into a list of tokens.
+ */
+export declare function tokenize(input: {
+    css: {
+        valueOf(): string;
+    };
+    unicodeRangesAllowed?: boolean;
+}, options?: {
+    onParseError?: (error: ParseError) => void;
+}): Array<CSSToken>;
+
+/**
+ * Create a tokenizer for a CSS string.
+ */
+export declare function tokenizer(input: {
+    css: {
+        valueOf(): string;
+    };
+    unicodeRangesAllowed?: boolean;
+}, options?: {
+    onParseError?: (error: ParseError) => void;
+}): {
+    nextToken: () => CSSToken;
+    endOfFile: () => boolean;
+};
+
+export declare interface TokenNumber extends Token<TokenType.Number, {
+    /**
+     * The numeric value.
+     */
+    value: number;
+    /**
+     * `integer` or `number`
+     */
+    type: NumberType;
+    /**
+     * The sign character as it appeared in the source.
+     * This is only useful if you need to determine if a value was written as "2" or "+2".
+     */
+    signCharacter?: '+' | '-';
+}> {
+}
+
+export declare interface TokenOpenCurly extends Token<TokenType.OpenCurly, undefined> {
+}
+
+export declare interface TokenOpenParen extends Token<TokenType.OpenParen, undefined> {
+}
+
+export declare interface TokenOpenSquare extends Token<TokenType.OpenSquare, undefined> {
+}
+
+export declare interface TokenPercentage extends Token<TokenType.Percentage, {
+    /**
+     * The numeric value.
+     */
+    value: number;
+    /**
+     * The sign character as it appeared in the source.
+     * This is only useful if you need to determine if a value was written as "2%" or "+2%".
+     */
+    signCharacter?: '+' | '-';
+}> {
+}
+
+export declare interface TokenSemicolon extends Token<TokenType.Semicolon, undefined> {
+}
+
+export declare interface TokenString extends Token<TokenType.String, {
+    /**
+     * The unescaped string value without the leading and trailing quotes.
+     */
+    value: string;
+}> {
+}
+
+/**
+ * All possible CSS token types
+ */
+export declare enum TokenType {
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#comment-diagram}
+     */
+    Comment = "comment",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-at-keyword-token}
+     */
+    AtKeyword = "at-keyword-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-bad-string-token}
+     */
+    BadString = "bad-string-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-bad-url-token}
+     */
+    BadURL = "bad-url-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-cdc-token}
+     */
+    CDC = "CDC-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-cdo-token}
+     */
+    CDO = "CDO-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-colon-token}
+     */
+    Colon = "colon-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-comma-token}
+     */
+    Comma = "comma-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-delim-token}
+     */
+    Delim = "delim-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-dimension-token}
+     */
+    Dimension = "dimension-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-eof-token}
+     */
+    EOF = "EOF-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-function-token}
+     */
+    Function = "function-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-hash-token}
+     */
+    Hash = "hash-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-ident-token}
+     */
+    Ident = "ident-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-percentage-token}
+     */
+    Number = "number-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-percentage-token}
+     */
+    Percentage = "percentage-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-semicolon-token}
+     */
+    Semicolon = "semicolon-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-string-token}
+     */
+    String = "string-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-url-token}
+     */
+    URL = "url-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#typedef-whitespace-token}
+     */
+    Whitespace = "whitespace-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#tokendef-open-paren}
+     */
+    OpenParen = "(-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#tokendef-close-paren}
+     */
+    CloseParen = ")-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#tokendef-open-square}
+     */
+    OpenSquare = "[-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#tokendef-close-square}
+     */
+    CloseSquare = "]-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#tokendef-open-curly}
+     */
+    OpenCurly = "{-token",
+    /**
+     * @see {@link https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/#tokendef-close-curly}
+     */
+    CloseCurly = "}-token",
+    /**
+     * Only appears in the token stream when the `unicodeRangesAllowed` option is set to true.
+     *
+     * @example
+     * ```js
+     * import { tokenize } from '@csstools/css-tokenizer';
+     *
+     * const tokens = tokenize({
+     * 	css: `U+0025-00FF, U+4??`,
+     * 	unicodeRangesAllowed: true,
+     * });
+     *
+     * console.log(tokens);
+     * ```
+     *
+     * @see {@link https://drafts.csswg.org/css-syntax/#typedef-unicode-range-token}
+     */
+    UnicodeRange = "unicode-range-token"
+}
+
+export declare interface TokenUnicodeRange extends Token<TokenType.UnicodeRange, {
+    startOfRange: number;
+    endOfRange: number;
+}> {
+}
+
+export declare interface TokenURL extends Token<TokenType.URL, {
+    /**
+     * The unescaped URL value without the leading `url(` and trailing `)`.
+     */
+    value: string;
+}> {
+}
+
+export declare interface TokenWhitespace extends Token<TokenType.Whitespace, undefined> {
+}
+
+export { }