Render: quick styles render on empty placeholder text boxes (#832)

The render gate for an empty placeholder's fill checked only
s.fill.is_none(). A quick style that sets a style reference without
an explicit fill left s.fill as None, so the gate skipped the fill
even though the shape had been formatted — the style only appeared
after text was added.

The gate now also checks s.line and s.style: if any of the three has
a local override, the placeholder is considered formatted and the
fill is drawn. A truly unformatted empty placeholder still shows the
dashed outline and prompt.

ROADMAP.md

@@ -137,6 +137,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 | 2026-10-17 | Edit Points: turning a shape into a freeform is one undo step, so Undo brings the original shape back (it used to stay a freeform) |
 | 2026-10-17 | While a placeholder's text is being edited, a click on a shape in front of it selects that shape instead of moving the caret, as in PowerPoint (#931) |
 | 2026-10-15 | Native saves keep an imported chart's embedded workbook, drawings and relationships; headless PPTX → edit → native save/reopen → PPTX tests verify the payloads and stale-workbook rejection |
+| 2026-10-15 | Render: quick styles render on empty placeholders — the fill gate now checks for style and line overrides too (#832) |
 | 2026-10-15 | PPTX trigger sequences keep separate On Click steps, including paragraph builds; synthetic import/edit/save/reopen and headless show regressions |
 | 2026-10-16 | Export: PNG with a transparent background — the slide background is left out, only the slide's content is drawn (Export… dialog, File › Export, web download, `file.export`/`file.render` `transparentBackground`, `deckcraft-cli render --transparent`) (#784) |
 | 2026-10-16 | Arrange ▸ Align: Align to Slide and Align Selected Objects, as in PowerPoint. One object aligns to the slide and several to each other until the other choice is ticked; the choice holds for that selection and also drives Distribute |

crates/render/src/lib.rs

@@ -1106,7 +1106,7 @@ impl Renderer {
             }
             _ => {
                 if let Some(fl) = &fill
-                    && !(empty_ph && f.opts.edit && s.fill.is_none())
+                    && !(empty_ph && f.opts.edit && s.fill.is_none() && s.line.is_none() && s.style.is_none())
                 {
                     for (i, sp) in geo.paths.iter().enumerate() {
                         if sp.fill == FillMode::None || fade(i).fill <= 0.0 {