v1.5.0

AI Polish Upgrade

• Added 5 AI polish modes: quick polish, structured rewrite, variable templating, strict output format, and diagnosis.
• Added structured AI result sections: diagnosis, improved prompt, variable suggestions, output format, and risk notes.
• Added copy result, replace current prompt, and save-as-new actions.
• Added better loading state, disabled action states, classified error messages, and a longer 120-second AI polish timeout for slower compatible models.
• Updated README with detailed usage guidance for AI polish modes, optimization directions, and recommended combinations.

Validation

• node test\ai-polish-utils.test.js
• node test\context-menu-utils.test.js
• node test\pro-utils.test.js
• JS syntax check for all .js files
• manifest.json parse check