Andrew Charlwood 6331d44165 fix: prevent DataFrame mutation in prepare_data() causing indication charts to fail ...

prepare_data() mapped Provider Code → Name in-place. When called for directory
charts first, then indication charts, the second call re-mapped already-mapped
values to NaN, silently dropping all data. Added df.copy() to prevent mutation.

Also fixes directory charts only generating data for the first date filter.

Results: 3,633 pathway nodes now generated (1,101 directory + 2,532 indication)
across all 12 datasets (6 date filters × 2 chart types).

2026-02-05 20:10:12 +00:00

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