Draw bookmark frequency markers on the spectrum canvas: amber vertical
line + ribbon shape (rectangle with V-notch) at each bookmark in view.
Below the freq axis, show a #spectrum-bookmark-axis row of clickable
amber ribbon labels (clip-path bookmark shape); clicking tunes the rig.
Labels auto-appear / collapse as bookmarks scroll in and out of view.
Server: reject POST/PUT with 409 Conflict when another bookmark already
exists at the requested freq_hz (BookmarkStore::freq_taken helper).
Client: bmFetch() triggers a spectrum redraw so markers appear
immediately on load without requiring a tab visit first.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
sjg
587b06c6d8
