Add bread_theme::shell manifest system (Phase 1)
Implements the shell theme manifest layer from THEME_SYSTEM_PLAN.md §4-5: ShellTheme/WindowSpec/Slots/Tokens/LayerRule types, TOML discovery (user -> system -> compiled-in builtin), one level of `extends` deep-merge, deny_unknown_fields validation naming the offending key, slot module-name validation, and css() token substitution with an extra.css overlay. load() never fails, falling back to the compiled-in builtin and logging once. Ships exactly one builtin manifest, liquid-motion, describing breadbar/breadbox as they exist today (not the design-doc demo, which disagrees with the code on bar side margin, launcher geometry, and the easing curves). Compositor rules and surface specs are keyed by layer-shell namespace and cover all five breadbar namespaces plus breadbox/breadbar-panel/breadbar-dismiss. watch() is gated behind the existing `gtk` feature (gio::FileMonitor is a gtk4 dependency); the rest of the module is gtk-free so bread and breadcrumbs can validate a theme without linking GTK. No consumer changes — breadbar/breadbox still use their own hardcoded values.
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bread-theme/assets/shell/liquid-motion/theme.toml
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bread-theme/assets/shell/liquid-motion/theme.toml
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# The compiled-in builtin theme (bread-theme/src/shell/builtin.rs). Describes
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# breadbar/breadbox AS THEY EXIST TODAY, not the 01-liquid-motion.html demo —
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# where the two disagree (bar side margin, launcher width/top, the two easing
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# curves), this file follows the current Rust source, since Phase 2's
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# acceptance test is pixel-identical rendering against today's bar.
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#
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# Sources: breadbar/src/main.rs:16-22 (BAR_* / CHIP_HEIGHT / ICON_PX consts),
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# breadbar/src/theme.rs (load_css's radius/pad/spring locals and the actual
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# CSS selectors), breadbar/src/{panel,osd}.rs and
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# breadbar/src/notifications/{popup,history}.rs (satellite window anchors,
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# margins, namespaces), breadbox/breadbox/src/main.rs:341-344 (launcher
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# geometry), ~/.config/hypr/scripts/ui/rules.lua (compositor rules).
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name = "Liquid Motion"
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id = "liquid-motion"
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[tokens]
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font_family = "Varela Round, sans-serif"
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font_fallback = "sans-serif"
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font_size_base = 14
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radius_bar = 16
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radius_card = 12
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radius_sm = 9
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# Not in the plan's §4 schema list, but a named local in theme.rs::load_css
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# alongside radius_bar/radius_card/radius_sm (`radius_pill = "999px"`) — the
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# OSD pill's corner radius.
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radius_pill = 999
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pad = 12
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bg_alpha = 0.72
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# Two curves theme.rs actually uses, not one: `spring` is the overshoot/bounce
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# curve (clock flips, pop-ins, the workspace caret draw); `spring_settle` is
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# the flatter curve used for hovers and workspace/stat-pair transitions. The
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# plan's §4 example names only `spring`.
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spring = "cubic-bezier(0.22, 1.35, 0.36, 1)"
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spring_settle = "cubic-bezier(0.22, 1.2, 0.36, 1)"
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# "accent" flows through as @accent (the workspace-trail gradient's start);
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# these are palette token NAMES, not hex - pywal still drives colour.
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accent_from = "accent"
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accent_to = "teal"
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# Not in the plan's §4 schema list, but breadbar::CHIP_HEIGHT / ::ICON_PX
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# today.
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chip_height = 32
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icon_px = 24
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[bar.window]
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anchors = ["top", "left", "right"]
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width = "fill"
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height = 44
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margin = { top = 12, left = 16, right = 16 }
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exclusive = "auto"
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# breadbar never calls gtk4-layer-shell's set_keyboard_mode today, which
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# defaults to KeyboardMode::None — spelled out explicitly here rather than
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# left to omit-means-default, since "the shell must never fail to start
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# because a theme file is malformed" cuts both ways: an explicit builtin
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# value can't silently drift if the crate's own Default ever changes.
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keyboard = "none"
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layer = "top"
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[bar.slots]
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left = ["workspaces"]
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centre = ["media", "clock"]
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right = ["volume", "wifi", "battery", "control"]
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drawer = []
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[modules.workspaces]
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style = "trail"
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show_empty = true
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[modules.clock]
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style = "flip"
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format = "%H:%M"
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show_date = false
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[launcher]
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# breadbox/breadbox/src/main.rs:341-344 sets vbox.set_margin_top(120) and
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# vbox.set_size_request(600, -1) — the demo's "540px overlay, 16% top" is a
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# design-doc approximation, not what the code does today.
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mode = "overlay"
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width = 600
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top = "120px"
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radius = 20
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icon_px = 36
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row_anim = "flip"
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rule = "gradient"
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footer = "count_apps"
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sections = false
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modes = ["apps"]
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# Keyed by layer-shell namespace, matching [compositor.*] below, so the two
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# tables share one keyspace and can be validated against each other.
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# breadbar-notif's popup toast uses set_default_width(320) (its history
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# sibling on the same namespace uses 360 — 320 is the live-toast surface, the
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# one this positions). breadbar-panel sets no window width at all: its
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# popovers size from their own CSS (.control-panel-inner / .wifi-popover-inner
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# min-width), which is why its width is "auto" rather than a number.
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[surfaces."breadbar-notif"]
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anchor = "top_right"
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offset = [16, 64]
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width = 320
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layer = "overlay"
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[surfaces."breadbar-osd"]
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anchor = "bottom_centre"
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offset = 80
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width = 180
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layer = "overlay"
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[surfaces."breadbar-panel"]
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anchor = "top_right"
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offset = [16, 64]
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width = "auto"
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layer = "overlay"
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[surfaces."breadbar-dismiss"]
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# Anchored to all four edges (a fullscreen click-away scrim) with only a top
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# margin, so it starts below the bar rather than covering it.
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anchor = "fill"
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offset = 56
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width = "fill"
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layer = "overlay"
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# Faithful to scripts/ui/rules.lua's five breadbar namespaces + breadbox.
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[compositor."breadbar"]
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blur = true
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ignore_alpha = 0.2
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blur_popups = true
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animation = "slide top"
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[compositor."breadbar-osd"]
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blur = true
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ignore_alpha = 0.2
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animation = "slide bottom"
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[compositor."breadbar-notif"]
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blur = true
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ignore_alpha = 0.2
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animation = "slide right"
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[compositor."breadbar-panel"]
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blur = true
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ignore_alpha = 0.2
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animation = "slide right"
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[compositor."breadbar-dismiss"]
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no_anim = true
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[compositor."breadbox"]
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blur = true
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ignore_alpha = 0.2
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# No `css = "..."` overlay: the builtin is compiled in via `include_str!`
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# and has no on-disk directory to resolve a relative overlay path against.
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# `extra.css` is for user/system themes, which do have one — see
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# `resolve_theme` in mod.rs.
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