fix(a11y): WCAG AA contrast retune for the Otter Orange palette (#567)

Fixes #557. Vivid fill, ink label: brand #E07832 stays on fills while primary-foreground flips to #1A1814 (5.83:1); new theme-aware ink tokens carry orange, destructive, and success text roles; opacity-modified text purged; landing, demo, and the docs fund button retuned. Guarded by a CSS-parsing unit contrast test, rebuilt axe baselines with zero contrast entries, a new landing axe smoke, and fully regenerated darwin visual baselines.

tests/qa/multifile.qa.spec.ts

@@ -238,7 +238,7 @@ test.describe("A) Multi-input tools", () => {
       // Since merge-audio requires 2+ inputs, each individual file fails, yielding
       // "All files failed processing". This confirms the batch-instead-of-merge bug.
       const errorText = await page
-        .locator("[role='alert'], .text-red-500")
+        .locator("[role='alert'], .text-destructive-ink, .text-red-500")
         .first()
         .innerText()
         .catch(() => "no error visible");
@@ -319,7 +319,7 @@ test.describe("A) Multi-input tools", () => {
       // Same bug as merge-audio: processAllFiles sends each file individually,
       // merge-csvs needs 2+ files, so each individual file fails.
       const errorText = await page
-        .locator("[role='alert'], .text-red-500")
+        .locator("[role='alert'], .text-destructive-ink, .text-red-500")
         .first()
         .innerText()
         .catch(() => "no error visible");
@@ -561,7 +561,7 @@ test.describe("A) Multi-input tools", () => {
         ).toBe(inputFiles.length);
       } else {
         const errorText = await page
-          .locator("[role='alert'], .text-red-500")
+          .locator("[role='alert'], .text-destructive-ink, .text-red-500")
           .first()
           .innerText()
           .catch(() => "no error visible");
@@ -771,7 +771,7 @@ test.describe("C) Edge cases", () => {
     let gotDownload = false;
     while (Date.now() < deadline) {
       const errorRegion = page
-        .locator("[role='alert'], [aria-live='assertive'], .text-red-500")
+        .locator("[role='alert'], [aria-live='assertive'], .text-destructive-ink, .text-red-500")
         .filter({ hasText: /error|failed|too many|maximum|limit|exceeded|invalid/i })
         .first();
       if (await errorRegion.isVisible().catch(() => false)) {

tests/qa/output-preview.qa.spec.ts

@@ -398,7 +398,9 @@ test.describe("1: Modality-crossing output previews", () => {
         }
       }
       // Check for error
-      const errorMsg = page.locator(".text-destructive, .text-red-500").first();
+      const errorMsg = page
+        .locator(".text-destructive, .text-destructive-ink, .text-red-500")
+        .first();
       if (await errorMsg.isVisible().catch(() => false)) {
         errorFound = true;
         break;

tests/qa/pipeline-ui.qa.spec.ts

@@ -127,7 +127,7 @@ test.describe("Pipeline Builder UI", () => {
 
     if (!hasPreview) {
       // Also check for error
-      const errorEl = page.locator(".text-red-500").first();
+      const errorEl = page.locator(".text-destructive-ink, .text-red-500").first();
       const errorText = await errorEl.textContent().catch(() => null);
       if (errorText) {
         console.log(`Pipeline UI error displayed: ${errorText}`);

tests/qa/settings-extended.qa.spec.ts

@@ -1490,7 +1490,7 @@ test.describe("FILE: csv-excel", () => {
     const issues = instrument(page);
     await setupTool(page, "csv-excel", CSV);
     // Process but check for inline errors too (the csv-excel tool surfaces
-    // errors in a <p class="text-red-500"> that waitForResult doesn't catch).
+    // errors in a <p class="text-destructive-ink"> that waitForResult doesn't catch).
     const submit = page.getByTestId("csv-excel-submit");
     await submit.first().click();
     // Wait up to 60s for either download button or an inline error
@@ -1498,7 +1498,7 @@ test.describe("FILE: csv-excel", () => {
     let gotResult = false;
     let inlineError = "";
     while (Date.now() < deadline) {
-      const errEl = page.locator(".text-red-500").first();
+      const errEl = page.locator(".text-destructive-ink, .text-red-500").first();
       if (await errEl.isVisible().catch(() => false)) {
         inlineError = await errEl.innerText().catch(() => "unknown error");
         gotResult = true;