feat(tests): add comprehensive test suite, update deps and Go 1.26.1

- Add 20+ tests for utility functions, SharedData, and Model
- Tests cover: LoadTables, LoadTableData, UpdateCell, pagination,
  table inference, focus/blur, empty database, invalid indices
- Update Go to 1.26.1, upgrade all dependencies
- Replace custom Min/Max with Go builtin min/max
- Format all files with goimports
- Add staticcheck to CI workflow

internal/app/edit_cell_keys.go

@@ -4,17 +4,17 @@ import "github.com/charmbracelet/bubbles/key"
 
 // EditCellKeyMap defines keybindings for the edit cell view
 type EditCellKeyMap struct {
-	Save          key.Binding
-	Cancel        key.Binding
-	CursorLeft    key.Binding
-	CursorRight   key.Binding
-	WordLeft      key.Binding
-	WordRight     key.Binding
-	LineStart     key.Binding
-	LineEnd       key.Binding
-	DeleteWord    key.Binding
-	DeleteChar    key.Binding
-	ToggleHelp    key.Binding
+	Save        key.Binding
+	Cancel      key.Binding
+	CursorLeft  key.Binding
+	CursorRight key.Binding
+	WordLeft    key.Binding
+	WordRight   key.Binding
+	LineStart   key.Binding
+	LineEnd     key.Binding
+	DeleteWord  key.Binding
+	DeleteChar  key.Binding
+	ToggleHelp  key.Binding
 }
 
 // DefaultEditCellKeyMap returns the default keybindings for edit cell
@@ -79,4 +79,4 @@ func (k EditCellKeyMap) FullHelp() [][]key.Binding {
 		{k.CursorLeft, k.CursorRight, k.WordLeft, k.WordRight},
 		{k.LineStart, k.LineEnd, k.DeleteWord, k.DeleteChar, k.ToggleHelp},
 	}
-}
+}