GramFrame Student Demo sessionStorage

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Student context: No "ANALYSIS" link on this page, so annotations use sessionStorage. They persist across page reloads within the same browser session, but are cleared when the browser closes.
Mock Spectrogram
time-start0
time-end10
freq-start0
freq-end50
Test steps:
  1. Add some markers in Cross Cursor mode
  2. Reload the page — markers should still be there
  3. No "Clear gram" button should be visible