Add log-points for NCA user input changes (Settings, Parameter Selection, Slope Selector, Exclusions)

[Gero1999]

Enhancement

The session log currently captures high-level operations (startup, data upload, NCA calculation start/end) but does not track user input changes within the NCA setup modules. This makes it difficult to reconstruct what configuration a user had when reviewing exported logs.

Motivation

When reviewing a session_log.txt from a ZIP export, analysts and developers should be able to see what NCA configuration choices the user made — not just that a calculation happened, but with what inputs.

Scope

Add log_info / log_debug calls to track user input changes in:

• Settings (tab_nca/setup/settings.R) — calculation method, dosing type, study type changes
• Parameter Selection (tab_nca/setup/parameter_selection.R) — parameters added/removed, selection changes
• Slope Selector (tab_nca/setup/slope_selector.R) — slope rule changes, subject/analyte selection
• General Exclusions — exclusion rule additions/removals/changes

Guidelines

• Use log_info for user-facing configuration changes (e.g. "Study type changed to 'SD'")
• Use log_debug for detailed data dumps (e.g. full parameter list)
• Keep messages concise and useful for post-hoc review
• Avoid logging on every reactive invalidation — only log on meaningful user actions

Depends on

• feat: replace logger with lightweight console logging + ZIP export #1212 (replace logger with console logging)