Merge PR #692 from NikitkaRa: UI: Format Background picture fill sets transparency and tiling

# Conflicts:
#	crates/engine/src/cmd/design.rs
#	crates/ui-egui/src/panes.rs

docs/gaps.md

@@ -26,6 +26,7 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; checklist letters unchanged, breadth stays 79%, dialogs stay 27; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines are drawn; previous: minor, chart trendlines round-trip; 3-D bevel, camera and face lighting rendered; IME composition and CJK interface text landed, #101; core-workflow alpha gate added; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (animated GIF export landed, #171; the video gap stays; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture options are pane controls, not a new dialog; dialogs stay 27; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -357,6 +358,10 @@ Detail in [ui-parity.md](ui-parity.md).
   Action Settings, Print, Insert Object…). 8–14 h.
 - **Dialogs**: 30 dialogs vs PowerPoint's ~60 (Font, Find/Replace dialog, Replace Fonts, Print,
   Insert Object…). Size and Position, Bullets and Numbering, Action Settings and Date and Time are in. 8–14 h.
+- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
+  Replace Fonts, Action Settings, Print, Insert Object…). Format Background picture options
+  (transparency, tile, offset, scale, alignment, mirror, and Apply to All copying a picture) are
+  pane controls on `design.background`, not another dialog. 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
@@ -450,6 +455,7 @@ Detail in [localization-parity.md](localization-parity.md).
 | 2026-10-13 | trivial | Command palette skips commands that need a value, so Export opens the dialog (#79) |
 | 2026-10-14 | minor | Design ▸ Effects applies a named effect scheme. The checklist row stays P, so breadth stays 79%. Dialogs stay 27 |
 | 2026-10-14 | minor | Slide Master Preserve and Title/Footers placeholders. Checklist letters unchanged (breadth stays 79%); dialogs stay 27 |
+| 2026-10-14 | minor | Format Background picture and solid options are in the existing pane. Dialogs stay 27 |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-13 | minor | Interactive decks: triggers, return-to-slide state and click rules landed in the slide show; the remaining pieces are one new entry under Features |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |

docs/target-app-parity.md

@@ -18,6 +18,7 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; percentages unchanged; previous: hours to ~95% per audience, ready ~55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers; automation counted at 236 commands; the menu measurement and the d556ff9 snapshot still count 226; percentages unchanged; previous: hours to ~95% per audience, ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (animated GIF export, #171: P2 breadth 36% → 37%, overall unchanged; previous: minor, hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture and solid options; percentages unchanged; previous: hours to ~95% per audience, ready ~55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -243,6 +244,9 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   Asian or complex-script faces).
   effect schemes (Design ▸ Effects: DeckCraft, Soft, Crisp, Lift, Glow, Plain),
   backgrounds (solid, gradient, picture, pattern), slide size presets.
+  backgrounds (solid, gradient, picture, pattern; a solid fill's transparency; picture
+  transparency, tile, offset, scale, alignment and mirror; Apply to All copies a picture),
+  slide size presets.
 - **Shapes:** ~180 preset geometries with adjustment handles, text boxes, pictures (crop,
   corrections, animated GIFs that play and pause), tables with styles, charts (column, bar, line,
   area, pie, doughnut, scatter and more), basic SmartArt, groups, connectors glued to sites,
@@ -343,6 +347,7 @@ scored done (16 open issues).
 | 2026-10-14 | minor | Design ▸ Effects noted under what works today. Percentages stay 79% / ~60% / ~55%. The d556ff9 snapshot and the menu measurement stay at 226 commands; the live registry is 227 |
 | 2026-10-14 | minor | Slide Master Preserve and Title/Footers placeholders. Automation in "what works today" is 236 commands; the menu-bar measurement and the d556ff9 snapshot still count 226. Percentages unchanged |
 | 2026-10-11 | minor | Animated GIF export (#171) moves the checklist's video/GIF row from missing to partial: P2 breadth 36% → 37%; overall breadth (79%), dimension scores and stage unchanged |
+| 2026-10-14 | minor | Format Background picture and solid options noted under what works today. Percentages, the 226-command count and the d556ff9 dialog snapshot stay as they are |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |

docs/ui-parity.md

@@ -22,6 +22,7 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Trim Media dialog follows the selection; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (the frame of a text box being edited moves it; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (table cells: caret, clicks between cells, border resizing; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture and solid options; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-14 · **Change:** minor (File › New starter decks; previous: minor, text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Sorter sections: add, rename, collapse, drag a whole section; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
@@ -30,6 +31,7 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Date and Time dialog; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; previous: text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture and solid options; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -92,6 +94,8 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, shadow/glow/reflection details (colour, transparency, blur, angle, distance, size), soft edges, size; no 3-D, thin picture/texture options |
 | Format Background pane | yes | yes |
 | Slide Master | Insert Layout, Rename, Delete, Preserve, Insert Placeholder, Title and Footers | Insert Layout, Rename, Delete, Insert Placeholder, and Preserve, Title and Footers checkboxes (`master.preserve`, `master.placeholders`). A master thumbnail selects the master |
+| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
+| Format Background pane | yes | yes: solid transparency; picture transparency, tile, offset, scale, alignment and mirror; Apply to All copies a picture. Stretch insets and rotate-with-shape are command parameters |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes: every slide, with Previous and Next on the Review tab |
@@ -227,6 +231,7 @@ on the slide as shapes. No pixel comparison against PowerPoint screenshots has b
 | 2026-10-14 | trivial | Trim Media dialog: start, end and fades follow the selected clip |
 | 2026-10-12 | minor | Dragging the frame of a text box being edited moves it, as in PowerPoint |
 | 2026-10-12 | minor | Table cells: caret and selection shown in the edited cell, clicks place the caret in the clicked cell, row and column borders drag to resize |
+| 2026-10-14 | minor | Format Background pane: solid transparency, picture transparency, tile, offset, scale, alignment, mirror, and Apply to All copying a picture. Not a new dialog; the dialog count stays 27 |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |