CSV Tool - Wails-based CSV editor with spreadsheet UI

Features:
- Spreadsheet-like table with cell navigation (arrow keys)
- Formula bar for editing cell values
- Click and drag cell selection with Shift+Arrow extend
- Column resize by dragging header borders, double-click for best fit
- Editable headers via double-click
- Command palette (Cmd+P) with 12 commands
- Copy/Cut/Paste with CSV, Markdown, and Jira formats
- Insert rows/columns above/below/left/right
- File drag-and-drop to open CSV files
- Native Open/Save dialogs
- Go backend for CSV parsing, formatting, and file I/O
- Vanilla JS frontend, no frameworks

Co-authored-by: Shelley <shelley@exe.dev>

frontend/wailsjs/go/main/App.d.ts

@@ -0,0 +1,31 @@
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+import {main} from '../models';
+
+export function FormatAsCSV(arg1:Array<string>,arg2:Array<any>):Promise<string>;
+
+export function FormatAsJira(arg1:Array<string>,arg2:Array<any>):Promise<string>;
+
+export function FormatAsMarkdown(arg1:Array<string>,arg2:Array<any>):Promise<string>;
+
+export function FormatAsSingleColumn(arg1:Array<any>):Promise<string>;
+
+export function FormatRowsAsCSV(arg1:Array<any>):Promise<string>;
+
+export function GetTableData():Promise<main.CSVData>;
+
+export function LoadCSV(arg1:string):Promise<main.CSVData>;
+
+export function OpenFileDialog():Promise<string>;
+
+export function ParseCSVString(arg1:string):Promise<main.CSVData>;
+
+export function SaveCSV(arg1:string,arg2:Array<string>,arg3:Array<any>):Promise<void>;
+
+export function SaveCurrentFile(arg1:Array<string>,arg2:Array<any>):Promise<void>;
+
+export function SaveFileDialog():Promise<string>;
+
+export function SetTableData(arg1:Array<string>,arg2:Array<any>):Promise<void>;
+
+export function SetWindowTitle(arg1:string):Promise<void>;

frontend/wailsjs/go/main/App.js

@@ -0,0 +1,59 @@
+// @ts-check
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+
+export function FormatAsCSV(arg1, arg2) {
+  return window['go']['main']['App']['FormatAsCSV'](arg1, arg2);
+}
+
+export function FormatAsJira(arg1, arg2) {
+  return window['go']['main']['App']['FormatAsJira'](arg1, arg2);
+}
+
+export function FormatAsMarkdown(arg1, arg2) {
+  return window['go']['main']['App']['FormatAsMarkdown'](arg1, arg2);
+}
+
+export function FormatAsSingleColumn(arg1) {
+  return window['go']['main']['App']['FormatAsSingleColumn'](arg1);
+}
+
+export function FormatRowsAsCSV(arg1) {
+  return window['go']['main']['App']['FormatRowsAsCSV'](arg1);
+}
+
+export function GetTableData() {
+  return window['go']['main']['App']['GetTableData']();
+}
+
+export function LoadCSV(arg1) {
+  return window['go']['main']['App']['LoadCSV'](arg1);
+}
+
+export function OpenFileDialog() {
+  return window['go']['main']['App']['OpenFileDialog']();
+}
+
+export function ParseCSVString(arg1) {
+  return window['go']['main']['App']['ParseCSVString'](arg1);
+}
+
+export function SaveCSV(arg1, arg2, arg3) {
+  return window['go']['main']['App']['SaveCSV'](arg1, arg2, arg3);
+}
+
+export function SaveCurrentFile(arg1, arg2) {
+  return window['go']['main']['App']['SaveCurrentFile'](arg1, arg2);
+}
+
+export function SaveFileDialog() {
+  return window['go']['main']['App']['SaveFileDialog']();
+}
+
+export function SetTableData(arg1, arg2) {
+  return window['go']['main']['App']['SetTableData'](arg1, arg2);
+}
+
+export function SetWindowTitle(arg1) {
+  return window['go']['main']['App']['SetWindowTitle'](arg1);
+}

frontend/wailsjs/go/main/CommandRegistry.d.ts

@@ -0,0 +1,5 @@
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+import {main} from '../models';
+
+export function GetCommands():Promise<Array<main.Command>>;

frontend/wailsjs/go/main/CommandRegistry.js

@@ -0,0 +1,7 @@
+// @ts-check
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+
+export function GetCommands() {
+  return window['go']['main']['CommandRegistry']['GetCommands']();
+}

frontend/wailsjs/go/models.ts

@@ -0,0 +1,37 @@
+export namespace main {
+	
+	export class CSVData {
+	    Headers: string[];
+	    Rows: string[][];
+	    FilePath: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new CSVData(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Headers = source["Headers"];
+	        this.Rows = source["Rows"];
+	        this.FilePath = source["FilePath"];
+	    }
+	}
+	export class Command {
+	    ID: string;
+	    Name: string;
+	    Shortcut: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new Command(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.ID = source["ID"];
+	        this.Name = source["Name"];
+	        this.Shortcut = source["Shortcut"];
+	    }
+	}
+
+}
+