Upgrade to Tailwind CSS v4

.pi-lens/cache/jscpd.json

@@ -2,6 +2,6 @@
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.pi-lens/cache/jscpd.meta.json

@@ -1,3 +1,3 @@
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+  "timestamp": "2026-04-18T19:53:09.821Z"
 }

.pi-lens/cache/knip.meta.json

@@ -1,3 +1,3 @@
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+  "timestamp": "2026-04-18T19:53:11.171Z"
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.pi-lens/cache/turn-end-findings-last.json

@@ -1,3 +1,3 @@
 {
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+  "signature": "postcss.config.js|src/styles.css::📐 Cascade errors in 1 other file(s) — fix before finishing turn:\n<diagnostics file=\"src/styles.css\">\n  line 1, col 2 code=lint/suspicious/noUnknownAtRules: Unexpected unknown at-rule: tailwind \n  line 2, col 2 code=lint/suspicious/noUnknownAtRules: Unexpected unknown at-rule: tailwind \n  line 3, col 2 code=lint/suspicious/noUnknownAtRules: Unexpected unknown at-rule: tailwind \n</diagnostics>"
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.pi-lens/cache/turn-end-findings-last.meta.json

@@ -1,3 +1,3 @@
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.pi-lens/cache/turn-end-findings.meta.json

@@ -1,3 +1,3 @@
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.pi-lens/turn-state.json

@@ -2,5 +2,5 @@
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