Add snippet/command library with CRUD and send-to-session

Full command snippet library for saving and sending reusable commands:

Backend:
- SQLite migration 003 creates snippets table
- Snippet model with name, command, description, folder, tags
- Store CRUD methods and API endpoints

Frontend:
- SnippetLibrary class with searchable list + detail/editor split view
- Create, edit, delete snippets in modal dialog
- 'Send to Session' button writes command to active terminal
- 'Send Snippet' option in terminal right-click context menu
- Ctrl+Shift+S keyboard shortcut to open library

frontend/wailsjs/go/api/Service.d.ts

@@ -17,6 +17,8 @@ export function ConnectSession(arg1:string):Promise<models.SessionInfo>;
 
 export function CreateProfile(arg1:models.Profile):Promise<models.Profile>;
 
+export function CreateSnippet(arg1:models.Snippet):Promise<models.Snippet>;
+
 export function DeleteKnownHost(arg1:string):Promise<void>;
 
 export function DeleteProfile(arg1:string):Promise<void>;
@@ -25,6 +27,8 @@ export function DeleteProfileSecrets(arg1:string):Promise<void>;
 
 export function DeleteRecording(arg1:string):Promise<void>;
 
+export function DeleteSnippet(arg1:string):Promise<void>;
+
 export function DisconnectSession(arg1:string):Promise<void>;
 
 export function DuplicateProfile(arg1:string):Promise<models.Profile>;
@@ -77,6 +81,8 @@ export function ListRecordings():Promise<Array<Record<string, any>>>;
 
 export function ListSessions():Promise<Array<models.SessionInfo>>;
 
+export function ListSnippets():Promise<Array<models.Snippet>>;
+
 export function LockSecretStore():Promise<void>;
 
 export function NewProfile(arg1:string):Promise<models.Profile>;
@@ -139,6 +145,8 @@ export function UnlockSecretStore(arg1:string):Promise<void>;
 
 export function UpdateProfile(arg1:models.Profile):Promise<models.Profile>;
 
+export function UpdateSnippet(arg1:models.Snippet):Promise<models.Snippet>;
+
 export function WriteSession(arg1:string,arg2:string):Promise<void>;
 
 export function WriteSessionEscaped(arg1:string,arg2:string):Promise<void>;

frontend/wailsjs/go/api/Service.js

@@ -30,6 +30,10 @@ export function CreateProfile(arg1) {
   return window['go']['api']['Service']['CreateProfile'](arg1);
 }
 
+export function CreateSnippet(arg1) {
+  return window['go']['api']['Service']['CreateSnippet'](arg1);
+}
+
 export function DeleteKnownHost(arg1) {
   return window['go']['api']['Service']['DeleteKnownHost'](arg1);
 }
@@ -46,6 +50,10 @@ export function DeleteRecording(arg1) {
   return window['go']['api']['Service']['DeleteRecording'](arg1);
 }
 
+export function DeleteSnippet(arg1) {
+  return window['go']['api']['Service']['DeleteSnippet'](arg1);
+}
+
 export function DisconnectSession(arg1) {
   return window['go']['api']['Service']['DisconnectSession'](arg1);
 }
@@ -150,6 +158,10 @@ export function ListSessions() {
   return window['go']['api']['Service']['ListSessions']();
 }
 
+export function ListSnippets() {
+  return window['go']['api']['Service']['ListSnippets']();
+}
+
 export function LockSecretStore() {
   return window['go']['api']['Service']['LockSecretStore']();
 }
@@ -274,6 +286,10 @@ export function UpdateProfile(arg1) {
   return window['go']['api']['Service']['UpdateProfile'](arg1);
 }
 
+export function UpdateSnippet(arg1) {
+  return window['go']['api']['Service']['UpdateSnippet'](arg1);
+}
+
 export function WriteSession(arg1, arg2) {
   return window['go']['api']['Service']['WriteSession'](arg1, arg2);
 }

frontend/wailsjs/go/models.ts

@@ -499,6 +499,52 @@ export namespace models {
 		    return a;
 		}
 	}
+	export class Snippet {
+	    id: string;
+	    name: string;
+	    command: string;
+	    description: string;
+	    folder: string;
+	    tags: string[];
+	    // Go type: time
+	    createdAt: any;
+	    // Go type: time
+	    updatedAt: any;
+	
+	    static createFrom(source: any = {}) {
+	        return new Snippet(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.id = source["id"];
+	        this.name = source["name"];
+	        this.command = source["command"];
+	        this.description = source["description"];
+	        this.folder = source["folder"];
+	        this.tags = source["tags"];
+	        this.createdAt = this.convertValues(source["createdAt"], null);
+	        this.updatedAt = this.convertValues(source["updatedAt"], null);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
 
 }