feat(donut): slice labels that stay inside their slice, icons and Show modes, group rings that follow the donut, and names along the ring

docs/ARCHITECTURE.md

@@ -287,6 +287,82 @@ without touching the file's content.
 - PDFs: ExifTool appends its changes as an update, so earlier values stay recoverable inside the file; the window says
   so.
 
+A group's ring scales with the donut: its gap, depth and narrowest slice (`DonutMenu.SubGap`, `SubBand`,
+`DonutGeometry.MinSubWidth`) and the window's room for it (`SubRingSpaceFor`) are multiplied by the ring scale,
+radius ÷ 150 × *Group ring size* (`DonutSettings.GroupRingSize`, 75–150 %), never below the default ring of the
+smallest donut (`MinRingScale`). *Group ring spread* (`GroupRingSpread`, 100–300 %) widens each ring slice after the
+narrowest-slice rule, up to one turn round the donut. Pointer tolerances (`BackdropMargin`, `LeaveEdge`) stay in
+pixels. At the defaults and radius 150 the ring is the same as before these settings.
+
+### Slice labels
+
+`Controls/SliceLabelLayout.cs` decides what each slice shows and where, without drawing; `DonutMenu.DrawSliceLabel`
+draws the result. Every label stays inside the slice's *safe zone*: the slice inset by a margin of `max(2·s,
+0.025·depth)` from all four edges (plus half the 3 px gap on the sides), and as far from a group's chevron: the mark
+itself, not a band across the slice, so a group slice's label is centred as any other's. The margin is kept from the
+letters, measured from their outlines (`LabelText.InkBox`) with each line at its own width (`StackInside`), not from the
+lines' boxes, which hold room above and below the letters: it leaves about the room today's donut leaves round its
+names. A box's edges are checked against the inner edge too, since it curves inward. `s = OuterRadius / 150` is the
+donut scale; names start at `max(10, 13 × LabelScale × s)` px, captions 80 % of that, icons 20·k beside a name or
+16–28·k alone (k = LabelScale · s).
+
+What a slice shows is its preset's `Show` (`LabelShow`: Auto, IconAndText, TextOnly, IconOnly), else its donut's
+`ToolbarProfile.LabelShow`, else Auto. `PlanRing` lays out a whole ring at once: one name size, one way for its names
+and one icon size, and for each slice the best its Show allows there. The ring's size runs from the starting one down,
+0.5 px at a time, to `max(10, 10 × s)` (`SizesFor`; the icon beside a name shrinks with it, to 16·k), and the ring takes
+the size and way with the fewest slices it can't label, then the fewest needed captions lost, then the fewest names cut
+so far they no longer read (under four letters or 40 % of them) or by only a letter or two, then the earlier way, then
+the largest size: on the face a name that doesn't fit is shortened rather than the ring made smaller (a group's ring, of
+short words, steps down before it shortens), and optional captions never make the names smaller. Icon & text keeps its
+icons: where an icon and its name, whole or shortened to `MinKept`, don't fit (the eight-slice back faces), the ring
+steps down rather than cut the name to a word ("Merge…"), which says less. A block goes on the slice's middle first, its
+letters centred there and moved sideways until it has as much room left of it as right of it (`Balanced`: a slice that
+runs aslant has more on one side); there it drops a caption it doesn't need before it moves. Upright lines wrap at the
+slice's width at its middle less 10 px (`ComfortableWidth`, as today's donut wraps its names), and run longer only where
+no wrapping fits. Only a block that fits nowhere on the middle is tried along the middle line and round from it
+(`Positions`): a three-slice face's slices run aslant. Auto: icon and whole name where every Auto slice of the ring has
+room for both and loses nothing for it (the caption it shows without its icon, and its place on the middle), else the
+whole name alone, else shortened to no less than 60 % of its letters and never dropping a word (`MinKept`), else
+shorter, else its icon alone. Icon & text: icon and whole name, else (a slice that needs its caption) the name and
+caption alone, else icon and name shortened to `MinKept` (wrapped as a name alone is: "Remove / metad…"), else the icon
+alone. Text only: the whole name, else shortened to `MinKept`, else as far as it takes. Slices of one name look alike:
+where one shows its name alone, the others do too. Captions show per slice, under a name where they fit, with Show
+output format on. A caption the slice needs (`NeedsCaption`: "Copy to folder" or "Move to folder" under a folder's name,
+or the format under a name another slice of the ring has too) shows with it off as well, and under the name beside an
+icon; an icon otherwise stands in for the caption. A slice without an icon (a format conversion) shows its name and
+doesn't decide the others' style. Icon and name: on a deep slice the icon above the name, both upright, else (where that
+can't show the name whole, or for Out from the centre) the icon before a name running out from the centre; on a wide
+slice the upright icon above a name bent along the ring, above it as read (the outer of the two on the top half, the
+inner on the bottom), else (a group ring's chip, too shallow for one above the other at most sizes) before it, side by
+side. The icon never turns. A ring takes one placement for all its icons (above their names where every one fits so, the
+face stepping down for it; else before them) and names, the one of its way (`ways` in `PlanRing`): straight under an
+upright icon, out from the centre after the icon, or bent beside it; a format's name beside them runs that way too, and
+a ring bends only if every name of it can (else all run level with it). Names wrap at word boundaries (CJK by character,
+Korean by word) and run one way for the whole ring, each way through the sizes, except a slice whose preset says its own
+(`Preset.Direction`: Straight, OutFromCentre, AlongRing; `SliceLabelLayout.Tries`). The donut's face keeps its names
+upright, and so does a group's ring of Chinese, Japanese or Korean names (turned, their characters read sideways). A
+group's ring, deeper than it is wide, tries straight or out from the centre, then bent; one wider than deep (`IsWide`,
+so the ring's size, its spread and the name size decide) bent along the ring, then straight, then out from the centre. A
+bent name (`LabelText.Curved`) puts each line on its own circle and each letter on it, upright, clockwise on the top
+half and anticlockwise on the bottom (`CurvedGlyphs`); it fits when its lines stay between the zone's circles and their
+ends clear the side edges at their inner edge (`CurvedFits`). Scripts whose letters join or reorder (Arabic, Hebrew, the
+Indic scripts, Thai, Lao, Myanmar) aren't bent but drawn level with the ring. A shortened name runs in the direction
+that keeps the most of it. `DonutMenu.LabelPlan` caches each ring's plan by its inputs (items, geometry, scale,
+settings), so labels are laid out once per change, not per frame; the open, pop and flip animations move them with
+transforms. Every group's ring slices are equally wide, whatever the group's size (`DonutGeometry.SubSpan`: a share of
+the group's slice and a quarter of each neighbour, as if three slices shared it, times Group ring spread), so a group of
+six fans out twice as far as a group of three and the spread looks the same on every group; it never goes round more
+than once. A group's ring labels follow the ring's scale instead of the donut's, and the Label scale as far as the
+ring's slices have room: `PlanRingToFit` steps the Label scale down 5 % at a time, not below 100 %, until every slice
+shows its whole name or its icon.
+
+The icons are a curated set of Material Design Icons (`SliceIcons.Data.cs`, generated; Apache-2.0, see
+THIRD-PARTY-NOTICES.md), keyed by their MDI names and grouped for the picker. `Preset.Icon` is a key, `"none"`, or
+unset for the default: a built-in preset's own (by id), else its tool's; plain format conversions have none.
+`Preset.ShortName` replaces the name on the donut and its rings (`DonutName` / `RingName`); the centre hint always
+names the slice in full (`DonutItem.FullName`). The preset and group editors share `SliceLabelFields` (Icon with
+`IconPickerFlyout`, Short name, Show); the Toolbar page sets each donut's Slice labels and Label scale.
+
 ## Crop overlay and PDF page editor
 
 The image Crop tool (`tool-crop`) and PDF Crop (`tool-pdf-crop`) open `Views/CropOverlayWindow` instead of running a job:

src/Filee.App/Assets/i18n/ar.json

@@ -340,6 +340,7 @@
   "hide.state_done": "تم",
   "preset.clip": "قص مقطع",
   "preset.group_crop_video": "اقتصاص إطار الفيديو",
+  "preset.group_crop_video.donut": "اقتصاص إطار الفيديو",
   "preset.crop_video_auto": "إزالة الأشرطة السوداء",
   "preset.crop_video_auto.short": "تلقائي",
   "preset.crop_video_16_9": "اقتصاص إلى 16:9",
@@ -427,6 +428,7 @@
   "image_edit.unit.Inches": "بوصة",
   "preset.grayscale": "تدرّج رمادي",
   "preset.remove_background": "إزالة الخلفية",
+  "preset.remove_background.donut": "إزالة الخلفية",
   "preset.trim_transparent": "قص الحواف الشفافة",
   "preset.group_rotate": "تدوير",
   "preset.rotate_left": "تدوير لليسار",
@@ -444,6 +446,7 @@
   "preset.flip_vertical": "انعكاس عمودي",
   "preset.flip_vertical.short": "عمودي",
   "preset.merge_pdf": "دمج PDF",
+  "preset.merge_pdf.donut": "دمج PDF",
   "merge.order_title": "اختيار ترتيب الدمج",
   "merge.order_hint": "استخدم الأسهم للتنقل بين البطاقات. لتغيير الترتيب، اسحب بطاقة أو استخدم Alt + ↑ / Alt + ↓. تُدمج الملفات من الأعلى إلى الأسفل. مفتاح Delete يحذف الملف المحدد.",
   "merge.sort_by": "ترتيب حسب",
@@ -500,11 +503,13 @@
   "pdf_editor.saved": "تم الحفظ: {0}",
   "preset.split_pdf": "تقسيم PDF",
   "preset.compress_pdf": "ضغط PDF",
+  "preset.compress_pdf.donut": "ضغط PDF",
   "preset.searchable_pdf": "PDF قابل للبحث",
   "preset.long_image": "صورة طويلة",
   "preset.pdf_slides": "PPTX (شرائح)",
   "preset.extract": "استخراج",
   "preset.zip_all": "ZIP واحد",
+  "preset.zip_all.donut": "ZIP واحد",
   "preset.extract_subtitles": "استخراج الترجمة",
   "preset.caption_video": "تسميات توضيحية",
   "preset.caption_video.donut": "تسميات",
@@ -513,23 +518,30 @@
   "preset.trace_line_art": "رسم خطي إلى SVG",
   "preset.trace_line_art.donut": "رسم خطي إلى SVG",
   "preset.extract_frames_png": "استخراج الإطارات (PNG)",
+  "preset.extract_frames_png.donut": "استخراج الإطارات (PNG)",
   "preset.extract_frames_jpg": "استخراج الإطارات (JPG)",
   "preset.extract_motion": "استخراج فيديو Live Photo",
   "preset.live_photo_iphone": "Live Photo (iPhone)",
   "preset.motion_photo_android": "Motion Photo (Android)",
   "preset.compress_image": "ضغط الصورة",
+  "preset.compress_image.donut": "ضغط الصورة",
   "preset.compress_video": "ضغط الفيديو",
+  "preset.compress_video.donut": "ضغط الفيديو",
   "preset.for_email": "فيديو للبريد الإلكتروني (أقل من 18 ميغابايت)",
   "preset.for_discord": "فيديو لـ Discord (أقل من 10 ميغابايت)",
   "preset.for_whatsapp": "فيديو لـ WhatsApp (720p، أقل من 16 ميغابايت)",
   "preset.for_instagram": "صورة لـ Instagram (JPG، بعرض 1080 بكسل)",
   "preset.video_from_images": "فيديو من الصور",
   "preset.extract_audio": "استخراج الصوت",
   "preset.merge_videos": "دمج الفيديوهات",
+  "preset.merge_videos.donut": "دمج الفيديوهات",
   "preset.compress_audio": "ضغط الصوت",
   "preset.merge_audio": "دمج الصوت",
+  "preset.merge_audio.donut": "دمج الصوت",
   "preset.merge_images": "دمج الصور",
+  "preset.merge_images.donut": "دمج الصور",
   "preset.remove_metadata": "إزالة البيانات الوصفية",
+  "preset.remove_metadata.donut": "إزالة البيانات الوصفية",
   "format.folder": "مجلد",
   "format.category.Image": "صورة",
   "format.category.Pdf": "PDF",
@@ -725,6 +737,14 @@
   "toolbar.hole": "الفتحة الوسطى",
   "toolbar.opacity": "العتامة",
   "toolbar.captions": "إظهار صيغة الناتج",
+  "toolbar.slice_labels": "تسميات القطاعات",
+  "toolbar.label_scale": "حجم التسميات",
+  "toolbar.ring_size": "حجم حلقة المجموعة",
+  "toolbar.ring_spread": "اتساع حلقة المجموعة",
+  "labels.auto": "تلقائي",
+  "labels.icon_text": "أيقونة ونص",
+  "labels.text_only": "نص فقط",
+  "labels.icon_only": "أيقونة فقط",
   "toolbar.new_preset": "إعداد مسبق جديد",
   "toolbar.new_group": "مجموعة جديدة",
   "toolbar.face_front": "الأمام",
@@ -788,6 +808,27 @@
   "presets.save": "حفظ",
   "presets.revert": "تراجع عن التغييرات",
   "presets.name": "الاسم",
+  "presets.icon": "الأيقونة",
+  "presets.icon_default": "الافتراضية",
+  "presets.icon_none": "بلا",
+  "presets.icon_search": "ابحث عن أيقونة",
+  "presets.icon_no_match": "لا توجد أيقونة تطابق البحث.",
+  "presets.short_name": "اسم مختصر",
+  "presets.short_name_hint": "يظهر على الشريط الدائري بدل الاسم",
+  "presets.show": "ما يظهر على القطاع",
+  "presets.show_donut": "إعداد الشريط الدائري",
+  "presets.direction": "اتجاه النص",
+  "labels.dir_straight": "مستقيم",
+  "labels.dir_out": "من المركز إلى الخارج",
+  "labels.dir_ring": "على طول الحلقة",
+  "icons.cat.files_and_folders": "الملفات والمجلدات",
+  "icons.cat.pictures": "الصور",
+  "icons.cat.crop_and_transform": "القص والتحويل",
+  "icons.cat.pdf_and_pages": "PDF والصفحات",
+  "icons.cat.video_and_audio": "الفيديو والصوت",
+  "icons.cat.text_and_data": "النص والبيانات",
+  "icons.cat.share_and_move": "المشاركة والنقل",
+  "icons.cat.general": "عام",
   "presets.target": "التحويل إلى",
   "presets.target_hidden": "الهدف الحالي ({0}) ينتمي فقط إلى مجالات معطلة، لذا لا يظهر في القائمة. سيبقى الهدف ما لم تختر هدفًا آخر.",
   "presets.same_as_source": "صيغة الملف الأصلي نفسها",