feat: rewrite APK parser to use version as delimiter

- Changed parseApkFilename to accept version parameter
- New parsing logic splits filename by version string to extract prefix
- detectEnvironment now takes prefix and configured tabs as arguments
- Environments not in APK_TABS are mapped to 'other' instead of hardcoded mapping
- Added getApkTabs helper function to expose configured tabs
- Updated all tests to use new API with version parameter

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/apk-parser.ts

@@ -1,4 +1,6 @@
-export type ApkEnvironment = 'dev' | 'sandbox' | 'product' | 'other';
+import { APK_TABS } from './constants';
+
+export type ApkEnvironment = 'product' | 'dev' | 'sandbox' | 'other';
 
 export interface ParsedApkMetadata {
   environment: ApkEnvironment;
@@ -6,37 +8,55 @@ export interface ParsedApkMetadata {
   isValid: boolean;
 }
 
-// Environment mapping based on filename patterns
-const ENVIRONMENT_MAP: Record<string, ApkEnvironment> = {
-  'timeshift': 'dev',
-  'lan': 'dev',
-  'dev': 'dev',
-  'sandbox': 'sandbox',
-};
+export function getApkTabs(): string[] {
+  return APK_TABS;
+}
 
-export function detectEnvironment(filename: string): ApkEnvironment {
-  // Pattern: ft_[environment]_version_commit.apk
-  // Extract the environment segment (alphabetic only) between first and second underscores
-  const match = filename.match(/^ft_([a-z]+)_/i);
+export function detectEnvironment(prefix: string, configuredTabs: string[]): ApkEnvironment {
+  // Empty prefix → other
+  if (!prefix) {
+    return 'other';
+  }
 
-  if (!match) {
-    // No environment suffix, default to product
+  // No underscore means product (e.g., "ft")
+  if (!prefix.includes('_')) {
     return 'product';
   }
 
-  const env = match[1].toLowerCase();
-  return ENVIRONMENT_MAP[env] || 'other';
+  // Extract environment from last segment after underscore
+  const lastUnderscoreIndex = prefix.lastIndexOf('_');
+  const env = prefix.substring(lastUnderscoreIndex + 1);
+
+  // Check if environment is configured
+  if (configuredTabs.includes(env)) {
+    return env as ApkEnvironment;
+  }
+
+  return 'other';
 }
 
-export function parseApkFilename(filename: string): ParsedApkMetadata {
-  const environment = detectEnvironment(filename);
+export function parseApkFilename(filename: string, version: string): ParsedApkMetadata {
+  // Use version as delimiter (with leading underscore)
+  const delimiter = `_${version}`;
+  const delimiterIndex = filename.indexOf(delimiter);
+
+  let prefix: string;
+  if (delimiterIndex > 0) {
+    prefix = filename.substring(0, delimiterIndex);
+  } else {
+    // Fallback: can't find version delimiter
+    prefix = '';
+  }
+
+  const environment = detectEnvironment(prefix, APK_TABS);
+
+  // Extract commit ID
   const commitMatch = filename.match(/([a-f0-9]{7,})\.apk$/);
   const commit = commitMatch ? commitMatch[1] : null;
-  const isValid = commit !== null;
 
   return {
     environment,
     commit,
-    isValid,
+    isValid: commit !== null,
   };
 }