fix(ui): unify colored-control text — white on all filled, both themes

The text color on filled colored controls was inconsistent: contained
primary resolved to white in both schemes, but error/success/warning/info
used a per-scheme contrastText (#fff light, #1a1a1a dark). So in DARK mode
a primary (red) button showed white text while an error (red) button —
e.g. every ConfirmDialog delete confirm, the contained "Smazat", and the
dashboard quick-action tiles — showed near-black text. "Black text on one
red button, white on another."

Unify on a single rule: every FILLED colored surface gets WHITE text/glyph
in BOTH themes. The palette .main stays bright in dark mode (it drives text,
outlined buttons and row tints), but a bright fill makes white illegible, so
filled surfaces drop to a darker fill in dark mode (new FILLED_DARK_BG, ≈ the
light-scheme shades; all ≥4.5:1 with white):
- theme MuiButton: contained error/success/warning/info -> white text +
  darker dark-mode fill (disabled state preserved).
- theme MuiChip: filled error/success/warning/info -> white label + darker
  dark-mode fill (covers StatusChip + status pills).
- StatCard icon badges: white glyph + darker dark-mode tile.

Plus two consistency cleanups:
- Detail-page "Smazat" unified to variant=outlined color=error (Offer +
  Invoice now match Order/Project/Warehouse; the contained->confirm pattern
  stays: subtle trigger, strong contained confirm dialog).
- "Zrušit filtry" reset buttons -> color=inherit (neutral), matching the
  rest of the secondary-button family (were default outlined-primary).

Neutral (color=inherit) text/outlined buttons were already correct (label =
ambient text color) and are untouched. tsc -b --noEmit, npm run build and
vitest 152/152 all clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/pages/InvoiceDetail.tsx

@@ -1140,7 +1140,11 @@ export default function InvoiceDetail() {
                 </Button>
               )}
               {hasPermission("invoices.delete") && (
-                <Button onClick={() => setDeleteConfirm(true)} color="error">
+                <Button
+                  onClick={() => setDeleteConfirm(true)}
+                  variant="outlined"
+                  color="error"
+                >
                   Smazat
                 </Button>
               )}
@@ -1710,7 +1714,11 @@ export default function InvoiceDetail() {
                     </Button>
                   ))}
                 {hasPermission("invoices.delete") && (
-                  <Button onClick={() => setDeleteConfirm(true)} color="error">
+                  <Button
+                    onClick={() => setDeleteConfirm(true)}
+                    variant="outlined"
+                    color="error"
+                  >
                     Smazat
                   </Button>
                 )}

src/admin/pages/OfferDetail.tsx

@@ -1184,7 +1184,11 @@ export default function OfferDetail() {
               </Button>
             )}
             {isEdit && hasPermission("offers.delete") && (
-              <Button onClick={() => setDeleteConfirm(true)} color="error">
+              <Button
+                onClick={() => setDeleteConfirm(true)}
+                variant="outlined"
+                color="error"
+              >
                 Smazat
               </Button>
             )}

src/admin/pages/WarehouseInventory.tsx

@@ -157,7 +157,7 @@ export default function WarehouseInventory() {
           />
         </Box>
         {statusFilter && (
-          <Button variant="outlined" onClick={resetFilters}>
+          <Button variant="outlined" color="inherit" onClick={resetFilters}>
             Zrušit filtry
           </Button>
         )}

src/admin/pages/WarehouseIssues.tsx

@@ -248,7 +248,7 @@ export default function WarehouseIssues() {
           />
         </Box>
         {hasActiveFilters && (
-          <Button variant="outlined" onClick={resetFilters}>
+          <Button variant="outlined" color="inherit" onClick={resetFilters}>
             Zrušit filtry
           </Button>
         )}

src/admin/pages/WarehouseReceipts.tsx

@@ -247,7 +247,7 @@ export default function WarehouseReceipts() {
           />
         </Box>
         {hasActiveFilters && (
-          <Button variant="outlined" onClick={resetFilters}>
+          <Button variant="outlined" color="inherit" onClick={resetFilters}>
             Zrušit filtry
           </Button>
         )}

src/admin/pages/WarehouseReservations.tsx

@@ -376,7 +376,7 @@ export default function WarehouseReservations() {
           </Box>
         )}
         {hasActiveFilters && (
-          <Button variant="outlined" onClick={resetFilters}>
+          <Button variant="outlined" color="inherit" onClick={resetFilters}>
             Zrušit filtry
           </Button>
         )}

src/admin/theme.ts

@@ -7,6 +7,19 @@ const FONT_MONO = "'DM Mono', Menlo, monospace";
 // Standard Material easing (matches the legacy --transition cubic-bezier).
 const EASE = "cubic-bezier(0.4, 0, 0.2, 1)";
 
+// Dark-mode fills for FILLED colored surfaces (contained buttons, filled chips,
+// StatCard badges). The palette .main stays BRIGHT in dark mode (it drives text,
+// outlined buttons and row tints), but a bright fill makes WHITE text/glyphs
+// illegible — so filled surfaces drop to these darker shades (≈ the light-scheme
+// values) in dark mode. One rule everywhere: filled colored = white text,
+// readable in both themes. Light mode needs no override (its .main is dark).
+export const FILLED_DARK_BG = {
+  error: { bg: "#dc2626", hover: "#b91c1c" },
+  success: { bg: "#15803d", hover: "#166534" },
+  warning: { bg: "#b45309", hover: "#92400e" },
+  info: { bg: "#1d4ed8", hover: "#1e40af" },
+} as const;
+
 export const theme = createTheme({
   cssVariables: {
     colorSchemeSelector: "[data-theme='%s']",
@@ -80,6 +93,47 @@ export const theme = createTheme({
           },
           "&:active": { transform: "translateY(0) scale(0.97)" },
         },
+        // Filled colored buttons: WHITE text in BOTH themes (was per-scheme
+        // contrastText → near-black text on colored fills in dark mode, which
+        // also clashed with the always-white primary — "black text on one red
+        // button, white on another"). In dark mode the fill drops to a darker
+        // shade so white stays legible.
+        containedError: ({ theme }) => ({
+          color: "#fff",
+          ...theme.applyStyles("dark", {
+            "&:not(.Mui-disabled)": {
+              backgroundColor: FILLED_DARK_BG.error.bg,
+              "&:hover": { backgroundColor: FILLED_DARK_BG.error.hover },
+            },
+          }),
+        }),
+        containedSuccess: ({ theme }) => ({
+          color: "#fff",
+          ...theme.applyStyles("dark", {
+            "&:not(.Mui-disabled)": {
+              backgroundColor: FILLED_DARK_BG.success.bg,
+              "&:hover": { backgroundColor: FILLED_DARK_BG.success.hover },
+            },
+          }),
+        }),
+        containedWarning: ({ theme }) => ({
+          color: "#fff",
+          ...theme.applyStyles("dark", {
+            "&:not(.Mui-disabled)": {
+              backgroundColor: FILLED_DARK_BG.warning.bg,
+              "&:hover": { backgroundColor: FILLED_DARK_BG.warning.hover },
+            },
+          }),
+        }),
+        containedInfo: ({ theme }) => ({
+          color: "#fff",
+          ...theme.applyStyles("dark", {
+            "&:not(.Mui-disabled)": {
+              backgroundColor: FILLED_DARK_BG.info.bg,
+              "&:hover": { backgroundColor: FILLED_DARK_BG.info.hover },
+            },
+          }),
+        }),
       },
     },
     MuiCard: {
@@ -99,6 +153,54 @@ export const theme = createTheme({
           fontWeight: 700,
           transition: `background-color 200ms ${EASE}, box-shadow 200ms ${EASE}`,
         },
+        // Filled colored chips follow the same rule as filled buttons: white
+        // label in both themes, darker fill in dark mode so white stays legible.
+        // (Chip has no per-color `filledX` key, so target the color class and
+        // scope to the filled variant.)
+        colorError: ({ theme }) => ({
+          "&.MuiChip-filled": {
+            color: "#fff",
+            ...theme.applyStyles("dark", {
+              backgroundColor: FILLED_DARK_BG.error.bg,
+              "&.MuiChip-clickable:hover": {
+                backgroundColor: FILLED_DARK_BG.error.hover,
+              },
+            }),
+          },
+        }),
+        colorSuccess: ({ theme }) => ({
+          "&.MuiChip-filled": {
+            color: "#fff",
+            ...theme.applyStyles("dark", {
+              backgroundColor: FILLED_DARK_BG.success.bg,
+              "&.MuiChip-clickable:hover": {
+                backgroundColor: FILLED_DARK_BG.success.hover,
+              },
+            }),
+          },
+        }),
+        colorWarning: ({ theme }) => ({
+          "&.MuiChip-filled": {
+            color: "#fff",
+            ...theme.applyStyles("dark", {
+              backgroundColor: FILLED_DARK_BG.warning.bg,
+              "&.MuiChip-clickable:hover": {
+                backgroundColor: FILLED_DARK_BG.warning.hover,
+              },
+            }),
+          },
+        }),
+        colorInfo: ({ theme }) => ({
+          "&.MuiChip-filled": {
+            color: "#fff",
+            ...theme.applyStyles("dark", {
+              backgroundColor: FILLED_DARK_BG.info.bg,
+              "&.MuiChip-clickable:hover": {
+                backgroundColor: FILLED_DARK_BG.info.hover,
+              },
+            }),
+          },
+        }),
       },
     },
     MuiOutlinedInput: {

src/admin/ui/StatCard.tsx

@@ -2,6 +2,7 @@ import type { ReactNode } from "react";
 import Box from "@mui/material/Box";
 import Typography from "@mui/material/Typography";
 import Card from "./Card";
+import { FILLED_DARK_BG } from "../theme";
 
 export type StatCardColor =
   | "default"
@@ -31,16 +32,19 @@ export default function StatCard({
   footer,
 }: StatCardProps) {
   // Solid tile + white glyph: high-contrast in both themes (the old light tint
-  // left the icon dark/low-visibility, esp. for the default variant).
+  // left the icon dark/low-visibility, esp. for the default variant). In dark
+  // mode the bright .main fill is darkened (same rule as filled buttons/chips)
+  // so the white glyph stays legible on success/warning/info/error tiles.
   const iconBg = color === "default" ? "grey.600" : `${color}.main`;
-  const iconColor = "common.white";
+  const iconDarkBg = (FILLED_DARK_BG as Record<string, { bg: string }>)[color]
+    ?.bg;
 
   return (
     <Card>
       <Box sx={{ display: "flex", alignItems: "flex-start", gap: 1.5 }}>
         {icon && (
           <Box
-            sx={{
+            sx={(theme) => ({
               display: "flex",
               alignItems: "center",
               justifyContent: "center",
@@ -48,9 +52,12 @@ export default function StatCard({
               height: 40,
               borderRadius: 2,
               bgcolor: iconBg,
-              color: iconColor,
+              color: "common.white",
               flexShrink: 0,
-            }}
+              ...(iconDarkBg
+                ? theme.applyStyles("dark", { backgroundColor: iconDarkBg })
+                : {}),
+            })}
           >
             {icon}
           </Box>