refactor(server): extract URL detection and color utils from index.js (#657)

No behavioral changes — 1:1 code move with imports replacing inline definitions.

server/utils/url-detection.js

@@ -0,0 +1,71 @@
+const ANSI_ESCAPE_SEQUENCE_REGEX = /\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~]|\][^\x07]*(?:\x07|\x1B\\))/g;
+const TRAILING_URL_PUNCTUATION_REGEX = /[)\]}>.,;:!?]+$/;
+
+function stripAnsiSequences(value = '') {
+    return value.replace(ANSI_ESCAPE_SEQUENCE_REGEX, '');
+}
+
+function normalizeDetectedUrl(url) {
+    if (!url || typeof url !== 'string') return null;
+
+    const cleaned = url.trim().replace(TRAILING_URL_PUNCTUATION_REGEX, '');
+    if (!cleaned) return null;
+
+    try {
+        const parsed = new URL(cleaned);
+        if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
+            return null;
+        }
+        return parsed.toString();
+    } catch {
+        return null;
+    }
+}
+
+function extractUrlsFromText(value = '') {
+    const directMatches = value.match(/https?:\/\/[^\s<>"'`\\\x1b\x07]+/gi) || [];
+
+    // Handle wrapped terminal URLs split across lines by terminal width.
+    const wrappedMatches = [];
+    const continuationRegex = /^[A-Za-z0-9\-._~:/?#\[\]@!$&'()*+,;=%]+$/;
+    const lines = value.split(/\r?\n/);
+    for (let i = 0; i < lines.length; i++) {
+        const line = lines[i].trim();
+        const startMatch = line.match(/https?:\/\/[^\s<>"'`\\\x1b\x07]+/i);
+        if (!startMatch) continue;
+
+        let combined = startMatch[0];
+        let j = i + 1;
+        while (j < lines.length) {
+            const continuation = lines[j].trim();
+            if (!continuation) break;
+            if (!continuationRegex.test(continuation)) break;
+            combined += continuation;
+            j++;
+        }
+
+        wrappedMatches.push(combined.replace(/\r?\n\s*/g, ''));
+    }
+
+    return Array.from(new Set([...directMatches, ...wrappedMatches]));
+}
+
+function shouldAutoOpenUrlFromOutput(value = '') {
+    const normalized = value.toLowerCase();
+    return (
+        normalized.includes('browser didn\'t open') ||
+        normalized.includes('open this url') ||
+        normalized.includes('continue in your browser') ||
+        normalized.includes('press enter to open') ||
+        normalized.includes('open_url:')
+    );
+}
+
+export {
+    ANSI_ESCAPE_SEQUENCE_REGEX,
+    TRAILING_URL_PUNCTUATION_REGEX,
+    stripAnsiSequences,
+    normalizeDetectedUrl,
+    extractUrlsFromText,
+    shouldAutoOpenUrlFromOutput
+};