fix: correct localStorage keys and reset state in resetCode (#143)

[devendra-w]

Closes #143

Changes Made

• Fixed incorrect localStorage keys in resetCode (was using webify-code-html/css/javascript, corrected to webify_code and webify_template_snapshots which match the actual autosave keys used in the codebase)
• Added setCurrentTemplateId(null) and setTemplateSnapshots({}) to fully reset editor state on reset
• Reset button was already present in the toolbar and wired up correctly

How to Test

1. Load any template or write some code in the editors
2. Click the Reset button in the toolbar
3. Confirm the dialog
4. All three editors (HTML, CSS, JS) should clear
5. Refreshing the page should not restore the old code (localStorage cleared correctly)

Screenshots

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