Restructure/frontend editor (#6404)

## Move editor under `frontend/editor/`

Pure restructure: `frontend/` becomes the workspace, `frontend/editor/`
holds
  the PDF editor. 1775 file renames + 40 wiring edits. No logic changes.

  ### Why

`frontend/` is currently the editor — its `src/`, `public/`,
`src-tauri/`,
  config files all sit at the root. Promoting `frontend/` to a
workspace and putting the editor in a sibling folder leaves room for
future
apps to drop in alongside it, sharing one `package.json` /
`node_modules` /
  lint config / Storybook.

  ### What moves

  frontend/
  ├── editor/                ← NEW: everything editor-specific
  │   ├── src/               ← was frontend/src/
  │   ├── public/            ← was frontend/public/
  │   ├── src-tauri/         ← was frontend/src-tauri/
│ ├── index.html, vite.config.ts, vitest.config.ts, playwright.config.ts
  │   ├── tsconfig*.json, tailwind.config.js, postcss.config.js
  │   ├── scripts/
  │   ├── .env, .env.desktop, .env.saas
  │   └── DeveloperGuide.md
├── package.json, package-lock.json, node_modules/ ← workspace install
  ├── eslint.config.mjs, .prettierrc, .prettierignore ← shared tooling
  ├── .gitignore
  └── README.md

  ### Wiring edits (40 files)

  - `.taskfiles/frontend.yml`, `desktop.yml`, `e2e.yml`
  - `build.gradle`, `app/core/build.gradle`
- `eslint.config.mjs`, `frontend/package.json`, `.gitignore`,
`.prettierignore`
  - `docker/frontend/Dockerfile`
  - 8 `.github/workflows/*.yml`, plus `.github/dependabot.yml`,
    `.github/config/.files.yaml`, `.github/labeler-config-srvaroa.yml`
  - `scripts/translations/**`
- Docs: `AGENTS.md`, `CLAUDE.md`, `ADDING_TOOLS.md`,
`DeveloperGuide.md`,
`WINDOWS_SIGNING.md`, `devGuide/HowToAddNewLanguage.md`,
`frontend/README.md`,
    `frontend/editor/DeveloperGuide.md`

Plus 3 renamed + edited: `editor/vite.config.ts` (env path +
node_modules
  walk-up), `editor/scripts/setup-env.mts` (renamed from `.ts` for
`import.meta.url`), `editor/scripts/build-provisioner.mjs` (resolve
src-tauri
  relative to script).

  ### Verification

  | Check | Result |
  |---|---|
  | `task frontend:typecheck:all` (6 variants) | exit 0 |
  | `task frontend:lint` (eslint + dpdm) | exit 0 |
  | `task frontend:format:check` | exit 0 |
  | `task frontend:test` | 657 tests pass, 50 files |
| `task frontend:build:{core,proprietary,saas,desktop,prototypes}` | all
green |
| `task desktop:build` | full Tauri pipeline →
`Stirling-PDF_2.11.0_x64_en-US.msi` |
  | `playwright test --list --project=stubbed` | 172 tests discovered |

`task desktop:build` exercises the heaviest path — Rust + WiX + MSI
bundle
against the moved `editor/src-tauri/`. If anything in the restructure
was
  wrong it wouldn't have built.

  ### Test plan

  - [ ] `frontend-validation.yml` green
  - [ ] `e2e-stubbed.yml` green
  - [ ] `tauri-build.yml` green on at least one platform
  - [ ] `check_toml.yml` runs on a translation-touching PR

---------

Co-authored-by: Claude Opus 4.7 (1M context) <[email protected]>

frontend/editor/src-tauri/src/utils/logging.rs

@@ -0,0 +1,90 @@
+use std::sync::Mutex;
+use std::collections::VecDeque;
+use std::fs::OpenOptions;
+use std::io::Write;
+use std::path::PathBuf;
+
+// Store backend logs globally
+static BACKEND_LOGS: Mutex<VecDeque<String>> = Mutex::new(VecDeque::new());
+
+// Get platform-specific log directory
+fn get_log_directory() -> PathBuf {
+    if cfg!(target_os = "macos") {
+        // macOS: ~/Library/Logs/Stirling-PDF
+        let home = std::env::var("HOME").unwrap_or_else(|_| "/tmp".to_string());
+        PathBuf::from(home).join("Library").join("Logs").join("Stirling-PDF")
+    } else if cfg!(target_os = "windows") {
+        // Windows: %APPDATA%\Stirling-PDF\logs
+        let appdata = std::env::var("APPDATA").unwrap_or_else(|_| std::env::temp_dir().to_string_lossy().to_string());
+        PathBuf::from(appdata).join("Stirling-PDF").join("logs")
+    } else {
+        // Linux: ~/.config/Stirling-PDF/logs
+        let home = std::env::var("HOME").unwrap_or_else(|_| "/tmp".to_string());
+        PathBuf::from(home).join(".config").join("Stirling-PDF").join("logs")
+    }
+}
+
+// Helper function to add log entry
+pub fn add_log(message: String) {
+    let timestamp = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_secs();
+    
+    let log_entry = format!("{}: {}", timestamp, message);
+    
+    // Add to memory logs
+    {
+        let mut logs = BACKEND_LOGS.lock().unwrap();
+        logs.push_back(log_entry.clone());
+        // Keep only last 100 log entries
+        if logs.len() > 100 {
+            logs.pop_front();
+        }
+    }
+    
+    // Write to file
+    write_to_log_file(&log_entry);
+    
+    // Remove trailing newline if present
+    let clean_message = message.trim_end_matches('\n').to_string();
+    println!("{}", clean_message); // Also print to console
+}
+
+// Write log entry to file
+fn write_to_log_file(log_entry: &str) {
+    let log_dir = get_log_directory();
+    if let Err(e) = std::fs::create_dir_all(&log_dir) {
+        eprintln!("Failed to create log directory: {}", e);
+        return;
+    }
+    
+    let log_file = log_dir.join("tauri-backend.log");
+    
+    match OpenOptions::new()
+        .create(true)
+        .append(true)
+        .open(&log_file)
+    {
+        Ok(mut file) => {
+            if let Err(e) = writeln!(file, "{}", log_entry) {
+                eprintln!("Failed to write to log file: {}", e);
+            }
+        }
+        Err(e) => {
+            eprintln!("Failed to open log file {:?}: {}", log_file, e);
+        }
+    }
+}
+
+// Get current logs for debugging
+pub fn get_logs() -> Vec<String> {
+    let logs = BACKEND_LOGS.lock().unwrap();
+    logs.iter().cloned().collect()
+}
+
+// Command to get logs from frontend
+#[tauri::command]
+pub async fn get_tauri_logs() -> Result<Vec<String>, String> {
+    Ok(get_logs())
+}

frontend/editor/src-tauri/src/utils/mod.rs

@@ -0,0 +1,5 @@
+pub mod logging;
+pub mod paths;
+
+pub use logging::{add_log, get_tauri_logs};
+pub use paths::{app_data_dir, system_provisioning_dir};

frontend/editor/src-tauri/src/utils/paths.rs

@@ -0,0 +1,31 @@
+use std::path::PathBuf;
+
+pub fn app_data_dir() -> PathBuf {
+    if cfg!(target_os = "macos") {
+        let home = std::env::var("HOME").unwrap_or_else(|_| "/tmp".to_string());
+        PathBuf::from(home)
+            .join("Library")
+            .join("Application Support")
+            .join("Stirling-PDF")
+    } else if cfg!(target_os = "windows") {
+        let appdata = std::env::var("APPDATA")
+            .unwrap_or_else(|_| std::env::temp_dir().to_string_lossy().to_string());
+        PathBuf::from(appdata).join("Stirling-PDF")
+    } else {
+        let home = std::env::var("HOME").unwrap_or_else(|_| "/tmp".to_string());
+        PathBuf::from(home).join(".config").join("Stirling-PDF")
+    }
+}
+
+pub fn system_provisioning_dir() -> Option<PathBuf> {
+    if cfg!(target_os = "windows") {
+        let program_data = std::env::var("PROGRAMDATA").ok()?;
+        Some(PathBuf::from(program_data).join("Stirling-PDF"))
+    } else if cfg!(target_os = "macos") {
+        Some(PathBuf::from("/Library").join("Application Support").join("Stirling-PDF"))
+    } else if cfg!(target_os = "linux") {
+        Some(PathBuf::from("/etc").join("stirling-pdf"))
+    } else {
+        None
+    }
+}