NRCan / PlotFTIR / 35378403971

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Add Peak Detection and Deconvolution  (#36)

* Copied peak-fit and tests from ftirtools

* Adapted peak-fit.R and tests into project from FTIRtools

* Update Skills for calarity

* Merge resolution

* Add documentation for FTIR peak analysis functions

- Created documentation for `find_ftir_peaks` to detail peak finding in FTIR spectra.
- Added `fit_peaks` documentation to explain peak fitting methods and parameters.
- Introduced `fit_peak_df` for converting fitted peak objects to data frames.
- Documented `get_fit_method` and `get_fit_spectra` for retrieving fitting details.
- Added `plot_components`, `plot_fit_ftir_peaks`, and `plot_fit_residuals` for visualizing peak fitting results.
- Included French translations for all documentation entries to support bilingual users.

* Refactor peak-fit internals and tests

Renames several peak-fitting helper functions to internal-style names (prefixed with `.`) and updates call sites, tightens `method` validation in `fit_peaks()` with `rlang::arg_match()`, and refreshes roxygen tags/parameter docs. Test coverage is updated to match fitted peak expectations, add validation for even `sg_n_norm`, and make plot-label assertions less brittle.

* Update peak-fit.R

* added lint file

* refactor(peak-fit): migrate process_language to utils.R, fix internal fn calls, standardize cli errors, add @inheritParams for call param

* Updates for Review Comments

Adds explicit `signal` dependency checks in peak detection, preserves validated `ftir` objects across peak-fit plotting helpers, and fixes auto-peak argument forwarding in `fit_peaks()` via `do.call()`. It also removes `tibble::as_tibble()` usage from `fit_peak_df()` and cleans up package imports accordingly. Additional updates tighten `.process_language()` handling for `NULL`/empty inputs and make peak-fit tests call internal EM helpers explicitly through `PlotFTIR:::`.

* add vignette for peak fitting workflow with biodiesel dataset (@pbulsink, #noissue).

* Minor ... (continued)

1535 of 1626 new or added lines in 6 files covered. (94.4%)

4997 of 5123 relevant lines covered (97.54%)

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