Make Modify with Text-to-CAD selection arg optional by honoring skip: false on non-required args (#6992)

* Make "skip = false" non-required args appear in header

* Make non-required, unskippable selection args work

* Make prompt-to-edit's selection arg optional but non-skippable

* Update src/components/CommandBar/CommandBarSelectionInput.tsx

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

* Fix dumb logic bug

Thanks for user testing @Irev-dev

* Update mixed input to show selection

Feel free to revert @Irev-Dev if this is the wrong move, but I found it
odd that this component doesn't show the current selection in the text
like the other selection input does, so I copied that over.

* Merge branch 'main' into franknoirot/adhoc/optional-selection-args

* Merge branch 'main' into franknoirot/adhoc/optional-selection-args

* Merge remote-tracking branch 'origin' into franknoirot/adhoc/optional-selection-args

* fix tests

* change copy again

* Update src/components/CommandBar/CommandBarSelectionMixedInput.tsx

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

e2e/playwright/prompt-to-edit-snapshot-tests.spec.ts

@@ -99,6 +99,8 @@ test.describe('edit with AI example snapshots', () => {
       await test.step('fire off edit prompt', async () => {
         await cmdBar.captureTextToCadRequestSnapshot(test.info())
         await cmdBar.openCmdBar('promptToEdit')
+        await page.waitForTimeout(100)
+        await cmdBar.progressCmdBar()
         // being specific about the color with a hex means asserting pixel color is more stable
         await page
           .getByTestId('cmd-bar-arg-value')