feat(stacks-queues): expand from 1 to 28 algorithms

[reshinto]

Summary

• 27 new algorithms across 8 technique subcategories: validation (2), monotonic-stack (3), expression-evaluation (3), stack-design (4), stack-applications (3), queue-operations (4), queue-design (4), queue-applications (4)
• 3 new tracker variants: NumericStackTracker, ExpressionTracker, QueueTracker — each extends BaseTracker and produces StackQueueVisualState
• Extended StackQueueVisualState with optional fields for numeric arrays, queues, auxiliary stacks, output tokens, result arrays, circular buffers, monotonic ordering, and phase labels
• Extended StackQueueVisualizer with conditional rendering for all new visual state sections (queue row, auxiliary stack column, output/result rows, circular buffer ring, badges)
• Updated InputEditor to use GenericIntrospectEditor for stacks-queues (diverse input shapes)
• Fixed GenericIntrospectEditor to handle deeply-nested non-numeric arrays without crashing
• Optimized E2E specs: merged redundant per-algorithm tests (2-3 → 1 each), reducing total E2E test count from ~648 to ~365
• Updated CI: E2E shards 12 → 14, local Playwright workers 50% → 75%
• 27 new fn-import.d.ts entries with zero duplicates

Algorithms added

Technique	Algorithms
validation	min-remove-to-make-valid, longest-valid-parentheses
monotonic-stack	online-stock-span, remove-k-digits, sum-of-subarray-minimums
expression-evaluation	evaluate-reverse-polish, basic-calculator, infix-to-postfix
stack-design	min-stack, asteroid-collision, decode-string, max-frequency-stack
stack-applications	simplify-path, backspace-string-compare, remove-all-adjacent-duplicates
queue-operations	sliding-window-maximum, implement-queue-using-stacks, implement-stack-using-queues, number-of-recent-calls
queue-design	design-circular-queue, design-circular-deque, task-scheduler, moving-average-from-stream
queue-applications	generate-binary-numbers, interleave-first-half-queue, first-non-repeating-char-stream, flatten-nested-list-iterator

Test plan

• npm run lint passes
• npm run format passes
• npm run typecheck passes
• npm test — 6312 tests pass (676 files)
• npm run storybook:build passes
• E2E stacks-queues — 56 tests pass (28 algorithms × 2 assertions each)
• Full E2E suite — verify no regressions in other categories
• CI pipeline passes all shards