refactor: clean up opal-web duplication, dead code, and comment noise

- Deduplicate API_BASE (was defined in both client.js and endpoints.js)
- Extract EMPTY_STATE and persist() helper in auth store (DRY)
- Extract updateByUuid() in tasks store, normalize to .map() pattern
- Remove unused getQueueSize(), Select.svelte, and lib/index.js
- Modernize uuid.js to prefer crypto.randomUUID()
- Strip ~60 redundant comments that restated self-evident code

No behavior changes. Build passes, pre-existing type errors unchanged.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

opal-web/src/lib/components/InputBar.svelte

@@ -25,7 +25,6 @@
 		const trimmed = value.trim();
 		if (!trimmed || loading) return;
 
-		// Merge user input with active filter, deduplicating tokens
 		const merged = mergeInputWithFilter(trimmed, $activeFilter || '');
 
 		try {
@@ -61,22 +60,17 @@
 		}, 150);
 	}
 
-	/**
-	 * Insert text at cursor position
-	 * @param {string} text
-	 */
+	/** @param {string} text */
 	function insertAtCursor(text) {
 		if (!inputEl) return;
 		const start = inputEl.selectionStart ?? value.length;
 		const end = inputEl.selectionEnd ?? value.length;
 
-		// Add leading space if cursor isn't at start and prev char isn't a space
 		const needsSpace = start > 0 && value[start - 1] !== ' ';
 		const insert = (needsSpace ? ' ' : '') + text;
 
 		value = value.slice(0, start) + insert + value.slice(end);
 
-		// Restore focus and cursor position after the inserted text
 		const newPos = start + insert.length;
 		requestAnimationFrame(() => {
 			if (inputEl) {
@@ -86,18 +80,12 @@
 		});
 	}
 
-	/**
-	 * Get the current input value (for PropertyPills smart replace)
-	 * @returns {string}
-	 */
+	/** @returns {string} */
 	export function getInputValue() {
 		return value;
 	}
 
-	/**
-	 * Set the input value (for PropertyPills smart replace)
-	 * @param {string} newValue
-	 */
+	/** @param {string} newValue */
 	export function setInputValue(newValue) {
 		value = newValue;
 	}