Set actual axis limits when wlim/ylim specified in plots

[Copilot]

The wlim and ylim arguments in plotBiomass() and plotSpectra() only filtered data, not the actual axis ranges. This prevented visual comparison of plots with fixed axes (e.g., using diffviewer).

Changes

• plotDataFrame(): Added xlim/ylim parameters (default c(NA, NA)), passed to scale_x_continuous()/scale_y_continuous()
• plotBiomass(): Passes ylim through to plotDataFrame()
• plot_spectra(): Passes wlim as xlim and ylim to plotDataFrame()
• Tests: Verify limits are set correctly with NA and non-NA combinations

Data filtering behavior is preserved. NA values auto-scale to data range.

Example

# Compare plots with fixed y-axis
sim1 <- project(params, effort = 0.5, t_max = 20)
sim2 <- project(params, effort = 1.5, t_max = 20)

plotBiomass(sim1, species = "Cod", ylim = c(1e4, 1e10))
plotBiomass(sim2, species = "Cod", ylim = c(1e4, 1e10))
# Both plots now have identical axis ranges

# Partial specification
plotBiomass(sim, ylim = c(NA, 1e8))  # Auto lower limit, fixed upper

Fixes #194

Original prompt

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This section details on the original issue you should resolve

<issue_title>Allow user to specify range on axes in plots</issue_title>
<issue_description>Even functions that have a ylim argument only use it to subselect the data, not to specify the limits on the axis. The wlim and ylim arguments would need to be passed to plotDataFrame() and used there to set the axis limits.

Being able to fix the axes would be important for example for visually comparing two plots with diffviewer, see #194.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Allow user to specify range on axes in plots #250

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