Feature/issue 129 configurable recording timeout

[Yuva-Deekshitha-N]

Fixes #129

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Description

• Added configurable max recording timeout (5–120s) via the Settings panel

• Recording now stops automatically when the timeout expires

• Live countdown is displayed on the mic button while recording

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Related Issue

Fixes #129

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Type of Change

• Bug fix
• New feature
• Enhancement
• Documentation update
• Refactoring
• Performance improvement
• Tests
• Other (please specify)

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Changes Made

• SettingsPanel.jsx — added number input (5–120s, default 30s) saved to localStorage

• App.jsx — added countdown state, startCountdown/stopCountdown helpers, auto-stop on timeout expiry

• MicButton.jsx — renders live countdown badge while recording

• MicButton.css / SettingsPanel.css — styles for countdown badge and number input

• README.md — added "⚙️ Configurable Recording Timeout" section

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Testing

• Tested locally
• Existing tests pass
• Added new tests (if applicable)

Additional Notes:

Lint passes with 0 warnings and 0 errors (npm run lint).

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Screenshots (if applicable)

NA

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Checklist

• My code follows the project's coding style.
• I have linked the related issue.
• I have tested my changes.
• I have updated documentation where necessary.
• My changes do not introduce new warnings or errors.
• The project builds successfully.
• This PR only addresses the linked issue.