T25a Generative: prompt and settings

PromptEnhancer offers a fuller prompt with the words it adds washed,
split at punctuation; Use this takes it into the field, Keep mine
lets it go. StylePresetPicker and AspectRatioPicker are rows of Tab
stops, the chosen one in accent; a ratio chip draws its shape.
SeedInput keeps digits up to u32::MAX and rolls one with a die.
NegativePromptInput and ImageGenerationPanel point to forms::TagInput
and forms::Form. theme.generative() holds the chapter's sizes. The
gallery's preset pictures are the atrium photo in five styles.

tasks/ch21-30.md

@@ -208,33 +208,48 @@
 - [x] TraceViewer → `debug::TimelineProfiler` (a track per depth)
 - [x] EvalResultTable → `tables::DataTable` (Tag and Progress cells)
 
-## T25 Generative — `src/generative`
+## T25a Generative · Prompt and settings — `src/generative`
+
+- [x] ImageGenerationPanel → `forms::Form` of the fields below; Cmd-Enter generates
+- [x] PromptEnhancer
+- [x] NegativePromptInput → `forms::TagInput`
+- [x] StylePresetPicker
+- [x] SeedInput
+- [x] AspectRatioPicker
+
+## T25b Generative · Queue and results
 
-- [ ] ImageGenerationPanel
 - [ ] GenerationQueue
 - [ ] GenerationGrid
 - [ ] VariationPicker
-- [ ] PromptEnhancer
-- [ ] NegativePromptInput
-- [ ] StylePresetPicker
-- [ ] SeedInput
-- [ ] AspectRatioPicker
+- [ ] ImageCompare → `data_display::BeforeAfter`
+- [ ] ABCompareView
+
+## T25c Generative · Canvas
+
 - [ ] InpaintCanvas
 - [ ] MaskBrush
-- [ ] ImageCompare → `data_display::BeforeAfter`
+
+## T25d Generative · Sound and motion
+
 - [ ] AudioGenerationPlayer
 - [ ] VideoGenerationTimeline
 - [ ] TTSVoicePicker
+
+## T25e Generative · Models
+
 - [ ] ModelCard
 - [ ] ModelDownloadManager
 - [ ] ModelStatus
 - [ ] HardwareMonitor
 - [ ] FineTuneJobCard
+
+## T25f Generative · Data and prompts
+
 - [ ] DatasetViewer
 - [ ] EmbeddingVisualizer — 2D, 3D projection
 - [ ] PromptPlayground
 - [ ] PromptDiff / PromptVersionHistory
-- [ ] ABCompareView
 
 ## T26 Media — `src/media`