feat(umbriel): add compositor configuration and keybindings

dot_config/umbriel/outputs.toml

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+# Outputs by monitor identity (`umbriel outputs` → "Config name"), so the
+# settings follow a display across ports. Unlisted displays use their preferred
+# mode at scale 1.
+#
+# Scale: the externals land near 110 logical px per inch (the ultrawide's
+# native density), so a window keeps its size moving between them. The laptop
+# panel runs denser (149) at 1.5: at 2 its 1280x800 felt too zoomed in.
+#
+#   display          physical       ppi   scale  logical     logical ppi
+#   laptop panel     2560x1600      224   1.5    1706x1066   149
+#   Studio Display   5120x2880      218   2      2560x1440   109
+#   ultrawide        3440x1440      110   1      3440x1440   110
+#   portables        1920x1080      141   1.25   1536x864    113
+#
+# Layout: the laptop panel sits at the origin and each external display sits
+# directly to its left (negative x), bottoms aligned. The externals are used
+# one at a time, so they share that slot. Positions are logical, so a
+# display's offset is its scaled size.
+#
+# niri needed `output "DP-5" { off }` for the Studio Display's phantom 640x480
+# connector; Umbriel leaves connectors without a preferred mode or identity off.
+
+# Laptop panel, eDP-1 (niri 91-internal-display): one full-width column.
+[output."Tianma Microelectronics Ltd. TL134ADXP03 Unknown"]
+position = [0, 0]
+scale = 1.5
+vrr = "fullscreen"
+focus_at_startup = true
+
+[output."Tianma Microelectronics Ltd. TL134ADXP03 Unknown".layout.scrolling]
+default_extent_fraction = 1.0
+
+# Apple Studio Display (niri 93-apple-display): 2560x1440 logical.
+[output."Apple Computer Inc StudioDisplay 0x984262A7"]
+position = [-2560, -374]
+scale = 2.0
+
+[output."Apple Computer Inc StudioDisplay 0x984262A7".layout.scrolling]
+default_extent_fraction = 0.5
+
+# Samsung ultrawide (niri 92-ultrawide, Hyprland monitors.lua): 3440x1440.
+[output."Samsung Electric Company S34CG50 HNTY501103"]
+mode = "3440x1440@100"
+position = [-3440, -374]
+scale = 1.0
+vrr = "fullscreen"
+
+[output."Samsung Electric Company S34CG50 HNTY501103".layout.scrolling]
+default_extent_fraction = 0.333
+
+# Portable HDMI panel, mounted portrait (niri 94-portable-hdmi): 864x1536.
+[output."PNP(AOP) 16PM1QB 14490001D3X00"]
+transform = "90"
+position = [-864, -470]
+scale = 1.25
+
+[output."PNP(AOP) 16PM1QB 14490001D3X00".layout.scrolling]
+default_extent_fraction = 1.0
+
+# Portable USB-C panel (niri 95-portable-usbc): 1536x864.
+[output."ASUSTek COMPUTER INC ASUS MB16AC M8LMTF195749"]
+position = [-1536, 202]
+scale = 1.25
+
+[output."ASUSTek COMPUTER INC ASUS MB16AC M8LMTF195749".layout.scrolling]
+default_extent_fraction = 1.0