[ypriverol]

Closes #49. Stacked on #52: it targets #52's branch, so merge #52 first; GitHub will then retarget this PR to main.

The screenshot in #49 is PAD000009 again: plate medians −0.23 and −0.14.

Change

• Toggle: two buttons switch the "Sample Signal by Plate" boxes between As deposited and Plate-centred, where each assay's median on each plate is moved to its overall median. pyprideap applies no plate correction of its own, so the first view is the deposited data.
• Residual check: centring aligns the plate medians by construction, so aligned boxes alone don't show anything. The x-axis caption gives the share of PC1 explained by plate in each view, which is what reveals residual batch effects. The summary table gains an "After plate median centring (PC1)" row.
• Help text: explains this and warns that, when study groups are confined to single plates, centring also removes real biology.

On real data (PC1 explained by plate)

	as deposited	plate-centred
PAD000009	4%	0%
PAD000001	44%	1%
PAD000008	32%	1%
PAD000021 (31 plates)	17%	1%
PAD000002	34%	10%: plate structure remains after centring

Tests

• New tests check that centring removes a constant plate offset, and cover the toggle buttons, their visibility arrays and the PC1 caption.
• With CI's versions: 199 passed; ruff and mypy are clean.

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• src/pyprideap/viz/qc/compute.py
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