Fix clippy gate and a type error from the explicit-import change

Remove the unused imports the review flagged (cf.rs, pivot.rs, tables.rs, cmd/sheet.rs) so clippy -D warnings passes, and point the backstage parent-folder lookup at Path::to_str, which the fn-path rewrite had broken.

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Co-Authored-By: Codebuff <noreply@codebuff.com>

crates/engine/src/cf.rs

@@ -5,7 +5,7 @@ use std::collections::HashMap;
 
 use gridcraft_core::{CellRef, RangeRef, Value, compare};
 use gridcraft_model::{
-    Cell, CfOperator, CfRule, CfValueKind, Color, CondFormat, Fill, Formula, PatternType, Sheet, Style, Underline, Workbook, default_icon_thresholds,
+    CfOperator, CfRule, CfValueKind, Color, CondFormat, PatternType, Sheet, Style, Underline, Workbook, default_icon_thresholds,
 };
 
 /// The conditional look of one cell.

crates/engine/src/cmd/sheet.rs

@@ -8,7 +8,7 @@ use gridcraft_model::{Anchor, AnchorMode, Sheet, Visibility};
 use serde_json::{Value as Json, json};
 
 use super::{
-    CommandSpec, Ctx, EngineError, PROTECTED, Result, Session, bad, bool_param, cell_param_on, cmd, commit, edit, has_clipboard, has_doc, ok,
+    CommandSpec, Ctx, EngineError, PROTECTED, Result, Session, bad, bool_param, cell_param_on, cmd, edit, has_clipboard, has_doc, ok,
     parse_lines, str_param, target_range, target_sheet, u32_param,
 };
 

crates/engine/src/pivot.rs

@@ -13,7 +13,7 @@ pub use gridcraft_core::quote_sheet;
 use gridcraft_core::{CellError, CellRef, MAX_COLS, MAX_ROWS, RangeRef, Value, split_sheet};
 use gridcraft_model::{
     BorderLine, BorderStyle, Cell, Chart, Color, Fill, HAlign, NumFmt, PivotDateGroup, PivotField, PivotFilter, PivotFunc, PivotLayout, PivotShowAs,
-    PivotSort, PivotTable, PivotValue, Series, Style, StyleId, Theme, Workbook,
+    PivotSort, PivotTable, PivotValue, Series, Style, StyleId, Workbook,
 };
 
 use crate::pivot_calc::CalcSet;

crates/engine/src/tables.rs

@@ -2,7 +2,7 @@
 //! `TableStyleLight1…21 / Medium1…28 / Dark1…11` names so files round-trip).
 
 use gridcraft_core::{CellRef, RangeRef};
-use gridcraft_model::{BorderLine, BorderStyle, Cell, Color, Fill, Formula, PatternType, Style, Table, Theme, Workbook};
+use gridcraft_model::{BorderLine, BorderStyle, Cell, Color, Fill, Formula, PatternType, Style, Table, Workbook};
 
 /// (family, number) from a style name, e.g. `TableStyleMedium2` → ("Medium", 2).
 pub fn parse_style_name(name: &str) -> (&'static str, u32) {

crates/ui-egui/src/backstage.rs

@@ -353,7 +353,7 @@ fn new_tiles(app: &mut SheetApp, ui: &mut Ui, out: &mut Outcome) {
 fn split_path(path: &str) -> (String, String) {
     let p = std::path::Path::new(path);
     let name = p.file_name().and_then(std::ffi::OsStr::to_str).unwrap_or(path).to_string();
-    let folder = p.parent().and_then(std::ffi::OsStr::to_str).unwrap_or("").to_string();
+    let folder = p.parent().and_then(std::path::Path::to_str).unwrap_or("").to_string();
     (name, folder)
 }