fix: FilePreview fileType case + Tailwind v4 gradient transparent bug

- FilePreview.vue: add normalizedFileType computed to handle backend
  returning uppercase HTML/MD/PPTX (fixes preview/download buttons)
- FilePreview.vue: bg-gradient-to-r from-orange-500 -> bg-orange-500
  (Tailwind v4 gradient + CSS variable = transparent)
- ReportCard.vue: bg-gradient-to-r -> bg-orange-600 for selected state
- Add .opencode/, node_modules/, dist/ to .gitignore
- Initial git setup for publish project

mvnwDebug.cmd

@@ -0,0 +1,44 @@
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+
+@REM -----------------------------------------------------------------------------
+@REM Apache Maven Wrapper debug script, version 3.3.2
+@REM
+@REM Environment Variable Prerequisites
+@REM
+@REM   JAVA_HOME           (Optional) Points to a Java installation.
+@REM   MAVEN_BATCH_ECHO    (Optional) Set to 'on' to enable the echoing of the batch commands.
+@REM   MAVEN_BATCH_PAUSE   (Optional) set to 'on' to wait for a key stroke before ending.
+@REM   MAVEN_OPTS          (Optional) Java runtime options used when Maven is executed.
+@REM   MAVEN_SKIP_RC       (Optional) Flag to disable loading of mavenrc files.
+@REM   MAVEN_DEBUG_ADDRESS (Optional) Set the debug address. Default value is localhost:8000
+@REM -----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%"=="on" echo %MAVEN_BATCH_ECHO%
+
+@setlocal
+
+IF "%MAVEN_DEBUG_ADDRESS%"=="" @set MAVEN_DEBUG_ADDRESS=localhost:8000
+
+@set MAVEN_DEBUG_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=%MAVEN_DEBUG_ADDRESS%
+
+@call "%~dp0"mvnw.cmd %*