Fix polar plot trajectory to only show during active passes

The trajectory line now only appears when the satellite is currently
making the selected pass, fixing the confusing mismatch between the
predicted path and real-time position.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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+# Please enter the commit message for your changes. Lines starting
+# with '#' will be ignored, and an empty message aborts the commit.
+#
+# Committer: James Smith <jsmith@Jamess-MBP.Home>
+#
+# On branch main
+# Your branch is up to date with 'origin/main'.
+#
+# Changes to be committed:
+#	modified:   intercept.py
+#