The Background tab becomes Theme — solid colors or patterns, presets only, chevron-paged

Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY

DESIGN/03-board-ui.md

@@ -41,7 +41,7 @@ Toolbars are **pure enhancement**: every function they host already has a menu i
 
 ### Controls (settled)
 
-One **style editor** component — a background palette grid and a curated symbol grid — presented from three anchors: **embedded** in the card window sidebar's Style section (05-card-window.md) and in the board popover's styling area, and as a **popover** opened by Style… from a card/lane context menu or the menu bar (Board ▸ Style…, ⌥⌘S — 11-command-nexus.md; selection-aware: it styles the selected cards or lane, and with nothing selected, the board). One component, one behavior, three anchors — replacing the pathfinder's swatch-row-plus-Style-popover split, whose functions were right and whose form wasn't. **The anchors compose the halves they need** (2026-08-06): the card sidebar shows the symbol grid with the **color combo** (below) standing in for the background half — the narrow context the combo was built for; the board popover shows the background half only, its symbol picker beside the rename field owning the board glyph (two surfaces writing one key in one popover would read as two settings); the Style… popover carries both grids in full.
+One **style editor** component — a background palette grid and a curated symbol grid — presented from two anchors: **embedded** in the card window sidebar's Style section (05-card-window.md), and as a **popover** opened by Style… from a card/lane context menu or the menu bar (Board ▸ Style…, ⌥⌘S — 11-command-nexus.md; selection-aware: it styles the selected cards or lane, and with nothing selected, the board). One component, one behavior — replacing the pathfinder's swatch-row-plus-Style-popover split, whose functions were right and whose form wasn't. **The anchors compose the halves they need** (2026-08-06): the card sidebar shows the symbol grid with the **color combo** (below) standing in for the background half — the narrow context the combo was built for; the Style… popover carries both grids in full. (The board popover was briefly a third anchor — the background half embedded in its Theme tab — until the 2026-08-07 Theme rework made that tab preset-only; Style… with nothing selected is the board's manual grid now, and the popover's symbol picker beside the rename field still owns the board glyph.)
 
 - **Curated-first, panel-backed** (re-ratified 2026-08-06, reversing 2026-07-29's palette-only ruling): the background grid offers the 12 palette colors — every one AA-verified through one code path (ratified 2026-07-29: palette names route through the same runtime ink-selection seam as hand-written hex — the appearance flip picks the readable label vocabulary — and PaletteContrastTests pins that the chosen ink meets AA in both appearances for all 12 backgrounds, so palette drift can never silently break it) — plus a leading **None** well that removes the `background` key. Beside the grid the vocabulary now has a second, compact form: the **color combo** — a swatch-faced popup listing None, the role's twelve, the current off-palette value verbatim when there is one, and **Other…**, which opens the system Colors panel. The panel is the in-app escape hatch the 2026-07-29 ruling withheld: a pick landing exactly on a palette color stores the *name* (so a re-pick never drifts to a hex spelling), anything else stores the hex — the same unlimited vocabulary hand-editing always had, now pickable. An arbitrary pick changes no contrast story (it lands on the identical runtime ink computation hand-written hex already gets — 10-accessibility.md), and the quick-style recents stay palette-vocabulary: a panel pick never enters them.
 - **Curated symbol grid**: a hand-picked set (roughly five dozen kanban-relevant SF Symbols); its leading well is the level's default symbol and removes the `icon` key. Any other SF Symbol name works written by hand — named symbols the running OS knows, that is: inventories grow per macOS release, so a newer-OS name renders the level default on an older Mac, value preserved on disk — the palette stance again. No full-browser escape hatch in-app; the raw file is the escape hatch. (Symbols keep this stance deliberately — the 2026-08-06 color-panel reversal above is colors only: the system offers a Colors panel worth deferring to, and no symbol browser of equal standing.)
@@ -53,9 +53,9 @@ One **style editor** component — a background palette grid and a curated symbo
 
 ## Board popover
 
-**Restructure in progress (2026-08-07): the popover is going tabbed.** The symbol/name header stays at the top; below it sit three tabs — **Info**, **Background**, **Git** — each the settings surface for one aspect of board configuration, each designed in its own dedicated session (Git is an empty placeholder until its; Info and Background are settled). The bullets below describe the popover's pre-tab content; what of it rehomes into which tab — and where the git section lands — is the Git session's to settle. The rulings inside the bullets (rename semantics, the git postures, the popover/sheet split) stand; only their placement is in motion.
+**Restructure in progress (2026-08-07): the popover is going tabbed.** The symbol/name header stays at the top; below it sit three tabs — **Info**, **Theme**, **Git** — each the settings surface for one aspect of board configuration, each designed in its own dedicated session (Git is an empty placeholder until its; Info and Theme are settled). The bullets below describe the popover's pre-tab content; what of it rehomes into which tab — and where the git section lands — is the Git session's to settle. The rulings inside the bullets (rename semantics, the git postures, the popover/sheet split) stand; only their placement is in motion.
 
-**The Background tab** (settled 2026-08-07, its dedicated session): two surfaces, manual then generated. The **Color** section is the re-homed style-editor embed — background half only, `showsSymbols: false`, exactly the pre-tab composition rule (§ Styling ▸ Controls: the popover's symbol picker beside the rename field owns the board glyph) — same write path, same recents, so the embed's re-homing changed its address and nothing else. The **Generated** section is the faceted-background picker (DESIGN/explorations/board-backgrounds.md ▸ Faceted gallery, the reviewed recipe): four segmented filters — Tone (defaults to the current appearance), Colors mono/duo/trio, Mesh coarse/medium/fine, Saturation soft/mid/rich — over a horizontal carousel of the eight wheel hues, one seed per hue, plus a Reroll button that re-mints the seeds (filters change the treatment, Reroll changes the geometry; the preview and the applied file share a seed, so what's clicked is what lands). Clicking a swatch renders the recipe at the 3072 px decode ceiling off-main and lands it in one write: the PNG into the board root as `facets.png` (Finder-ladder rename only when a foreign file owns the name), `background.image` pointed at it, and `background.color` set to the recipe's primary color — the underlay that stands in while the image decodes or if the file ever goes missing. **Backgrounds ship as static pixels, never live-rendered views** (the perf/sync ruling, 2026-08-07): the generator runs at pick time, the render loop only ever composites a decoded bitmap. Native undo restores the two fields, not the overwritten bytes — regenerating over our own PNG is destructive, documented, and accepted (the escape hatch remains the raw file). The whole tab disables under the read-only lock as one surface.
+**The Theme tab** (settled 2026-08-07, its dedicated session; reworked same day from the first "Background" cut — the style-editor embed was in, then ruled out): a **preset-only** surface — no palette grid, no "Board" subtitle, no manual controls (the manual surface is Style… with nothing selected; the raw file remains the image escape hatch). One **Solid color / Pattern** segmented choice at the top, then the filters that apply to the chosen kind, then one carousel of the eight wheel hues with tall skinny chevrons flanking it (compact-chevron paging buttons, ~three swatches per press, each disabling at its end of the strip). **Solid color** shows Tone (defaults to the current appearance) and Saturation only; the carousel holds flat swatches — each hue at the selected tonality's base saturation and lightness, exactly the primary color the matching facets recipe would write — and clicking one sets `background.color` and *removes* `background.image` in one write (the generated PNG stays on disk so undo can restore the field that pointed at it). **Pattern** is the faceted-background picker (DESIGN/explorations/board-backgrounds.md ▸ Faceted gallery, the reviewed recipe): four filters — Tone and Saturation shared with Solid, plus Colors mono/duo/trio and Mesh coarse/medium/fine — over rendered previews, one seed per hue, plus a Reroll button that re-mints the seeds (filters change the treatment, Reroll the geometry; preview and file share a seed, so what's clicked is what lands). Clicking a pattern swatch renders the recipe at the 3072 px decode ceiling off-main and lands it in one write: the PNG into the board root as `facets.png` (Finder-ladder rename only when a foreign file owns the name), `background.image` pointed at it, and `background.color` set to the recipe's primary color — the underlay that stands in while the image decodes or if the file ever goes missing. The mode opens on whichever kind the board currently wears (Pattern when `background.image` is the generated file, Solid otherwise). **Backgrounds ship as static pixels, never live-rendered views** (the perf/sync ruling, 2026-08-07): the generator runs at pick time, the render loop only ever composites a decoded bitmap. Native undo restores the two fields, not overwritten bytes — regenerating over our own PNG is destructive, documented, and accepted. The whole tab disables under the read-only lock as one surface.
 
 ### Info tab (settled 2026-08-07)