Remove Electron settings panel (breaking change)

- Remove electron/settings/ folder
- Remove config-manager.ts and settings-window.ts
- Remove Configuration menu from app menu
- Remove config-presets IPC handlers
- Update README.md
- Clean up electron.d.ts

Note: This is a breaking change - users will lose existing presets

electron/main/ipc-handlers.ts

@@ -1,43 +1,4 @@
 import { app, BrowserWindow, dialog, ipcMain } from "electron"
-import {
-    applyPresetToEnv,
-    type ConfigPreset,
-    createPreset,
-    deletePreset,
-    getAllPresets,
-    getCurrentPreset,
-    getCurrentPresetId,
-    setCurrentPreset,
-    updatePreset,
-} from "./config-manager"
-import { restartNextServer } from "./next-server"
-
-/**
- * Allowed configuration keys for presets
- * This whitelist prevents arbitrary environment variable injection
- */
-const ALLOWED_CONFIG_KEYS = new Set([
-    "AI_PROVIDER",
-    "AI_MODEL",
-    "AI_API_KEY",
-    "AI_BASE_URL",
-    "TEMPERATURE",
-])
-
-/**
- * Sanitize preset config to only include allowed keys
- */
-function sanitizePresetConfig(
-    config: Record<string, string | undefined>,
-): Record<string, string | undefined> {
-    const sanitized: Record<string, string | undefined> = {}
-    for (const key of ALLOWED_CONFIG_KEYS) {
-        if (key in config && typeof config[key] === "string") {
-            sanitized[key] = config[key]
-        }
-    }
-    return sanitized
-}
 
 /**
  * Register all IPC handlers
@@ -123,90 +84,4 @@ export function registerIpcHandlers(): void {
             return false
         }
     })
-
-    // ==================== Config Presets ====================
-
-    ipcMain.handle("config-presets:get-all", () => {
-        return getAllPresets()
-    })
-
-    ipcMain.handle("config-presets:get-current", () => {
-        return getCurrentPreset()
-    })
-
-    ipcMain.handle("config-presets:get-current-id", () => {
-        return getCurrentPresetId()
-    })
-
-    ipcMain.handle(
-        "config-presets:save",
-        (
-            _event,
-            preset: Omit<ConfigPreset, "id" | "createdAt" | "updatedAt"> & {
-                id?: string
-            },
-        ) => {
-            // Validate preset name
-            if (typeof preset.name !== "string" || !preset.name.trim()) {
-                throw new Error("Invalid preset name")
-            }
-
-            // Sanitize config to only allow whitelisted keys
-            const sanitizedConfig = sanitizePresetConfig(preset.config ?? {})
-
-            if (preset.id) {
-                // Update existing preset
-                return updatePreset(preset.id, {
-                    name: preset.name.trim(),
-                    config: sanitizedConfig,
-                })
-            }
-            // Create new preset
-            return createPreset({
-                name: preset.name.trim(),
-                config: sanitizedConfig,
-            })
-        },
-    )
-
-    ipcMain.handle("config-presets:delete", (_event, id: string) => {
-        return deletePreset(id)
-    })
-
-    ipcMain.handle("config-presets:apply", async (_event, id: string) => {
-        const env = applyPresetToEnv(id)
-        if (!env) {
-            return { success: false, error: "Preset not found" }
-        }
-
-        const isDev = process.env.NODE_ENV === "development"
-
-        if (isDev) {
-            // In development mode, the config file change will trigger
-            // the file watcher in electron-dev.mjs to restart Next.js
-            // We just need to save the preset (already done in applyPresetToEnv)
-            return { success: true, env, devMode: true }
-        }
-
-        // Production mode: restart the Next.js server to apply new environment variables
-        try {
-            await restartNextServer()
-            return { success: true, env }
-        } catch (error) {
-            return {
-                success: false,
-                error:
-                    error instanceof Error
-                        ? error.message
-                        : "Failed to restart server",
-            }
-        }
-    })
-
-    ipcMain.handle(
-        "config-presets:set-current",
-        (_event, id: string | null) => {
-            return setCurrentPreset(id)
-        },
-    )
 }