feat(config): unify mpv plugin options under main config and add CSS/Ani

- Replace subminer.conf plugin config with mpv.* fields in config.jsonc
- Add socketPath, backend, autoStartSubMiner, pauseUntilOverlayReady, aniskipEnabled/buttonKey, subminerBinaryPath to mpv config
- Add subtitleSidebar.css field; migrate legacy sidebar appearance fields
- Add paintOrder and WebkitTextStroke to subtitle style options
- Update default subtitle/sidebar fontFamily to CJK-first stack
- Fix overlay visible state surviving mpv y-r restart
- Fix live config saves applying subtitle CSS immediately to open overlays
- Migrate legacy primary/secondary subtitle appearance into subtitleStyle.css on load
- Switch AniSkip button key setting to click-to-learn key capture

src/main/runtime/first-run-setup-plugin.ts

@@ -1,6 +1,6 @@
 import fs from 'node:fs';
 import path from 'node:path';
-import { resolveDefaultMpvInstallPaths, type MpvInstallPaths } from '../../shared/setup-state';
+import type { MpvInstallPaths } from '../../shared/setup-state';
 
 export interface InstalledFirstRunPluginCandidate {
   path: string;
@@ -27,51 +27,6 @@ export interface LegacyMpvPluginRemovalResult {
   failedPaths: Array<{ path: string; message: string }>;
 }
 
-function rewriteInstalledWindowsPluginConfig(configPath: string): void {
-  const content = fs.readFileSync(configPath, 'utf8');
-  const updated = content.replace(/^socket_path=.*$/m, 'socket_path=\\\\.\\pipe\\subminer-socket');
-  if (updated !== content) {
-    fs.writeFileSync(configPath, updated, 'utf8');
-  }
-}
-
-function sanitizePluginConfigValue(value: string): string {
-  return value.replace(/[\r\n]/g, '').trim();
-}
-
-function upsertPluginConfigLine(content: string, key: string, value: string): string {
-  const normalizedValue = sanitizePluginConfigValue(value);
-  const line = `${key}=${normalizedValue}`;
-  const pattern = new RegExp(`^${key}=.*$`, 'm');
-  if (pattern.test(content)) {
-    return content.replace(pattern, line);
-  }
-
-  const suffix = content.endsWith('\n') || content.length === 0 ? '' : '\n';
-  return `${content}${suffix}${line}\n`;
-}
-
-function rewriteInstalledPluginBinaryPath(configPath: string, binaryPath: string): boolean {
-  const content = fs.readFileSync(configPath, 'utf8');
-  const updated = upsertPluginConfigLine(content, 'binary_path', binaryPath);
-  if (updated === content) {
-    return false;
-  }
-  fs.writeFileSync(configPath, updated, 'utf8');
-  return true;
-}
-
-function readInstalledPluginBinaryPath(configPath: string): string | null {
-  const content = fs.readFileSync(configPath, 'utf8');
-  const match = content.match(/^binary_path=(.*)$/m);
-  if (!match) {
-    return null;
-  }
-  const rawValue = match[1] ?? '';
-  const value = sanitizePluginConfigValue(rawValue);
-  return value.length > 0 ? value : null;
-}
-
 export function resolvePackagedFirstRunPluginAssets(deps: {
   dirname: string;
   appPath: string;
@@ -338,36 +293,3 @@ export async function removeLegacyMpvPluginCandidates(options: {
     failedPaths,
   };
 }
-
-export function syncInstalledFirstRunPluginBinaryPath(options: {
-  platform: NodeJS.Platform;
-  homeDir: string;
-  xdgConfigHome?: string;
-  binaryPath: string;
-}): { updated: boolean; configPath: string | null } {
-  const installPaths = resolveDefaultMpvInstallPaths(
-    options.platform,
-    options.homeDir,
-    options.xdgConfigHome,
-  );
-  if (!installPaths.supported || !fs.existsSync(installPaths.pluginConfigPath)) {
-    return { updated: false, configPath: null };
-  }
-
-  const configuredBinaryPath = readInstalledPluginBinaryPath(installPaths.pluginConfigPath);
-  if (configuredBinaryPath) {
-    return { updated: false, configPath: installPaths.pluginConfigPath };
-  }
-
-  const updated = rewriteInstalledPluginBinaryPath(
-    installPaths.pluginConfigPath,
-    options.binaryPath,
-  );
-  if (options.platform === 'win32') {
-    rewriteInstalledWindowsPluginConfig(installPaths.pluginConfigPath);
-  }
-  return {
-    updated,
-    configPath: installPaths.pluginConfigPath,
-  };
-}