feat(printing/ui): Spool Print selection page UX Improvement

[akira69]

Summary

Improves the spool pre-print selection step for larger datasets while keeping PR869 independent from the filament-printing stack.

What Changed

• Added debounced full-dataset spool search via the existing spool ?search= API.
• Kept the selection table viewport-filling with visible server pagination controls.
• Kept bulk selection scoped to the currently visible rows.
• Added Location and Lot Nr columns and preserved multi-color filament preview handling.
• Carried forward shared saved-state hardening so malformed savedStates-* and malformed spool table hash/localStorage state recover instead of crashing.
• Removed unrelated filament-selector locale spillover from this PR.

Screenshots

New Selection Page Layout:

Simple Text Search Field:

Testing Performed

• cd client && ./node_modules/.bin/eslint src/pages/printing/spoolSelectModal.tsx src/utils/saveload.ts src/pages/printing/index.tsx
• uv run ruff check spoolman/api/v1/spool.py spoolman/database/spool.py
• /bin/bash -lc "cd /Users/dfinch/Code/Spoolman_Labels/worktrees/pr869/client && npm ci && VITE_APIURL=/api/v1 npm run build"
• PATH=.venv/bin:$PATH SPOOLMAN_DIR_DATA=/tmp/spoolman_pr_869_data uv run uvicorn spoolman.main:app --host 0.0.0.0 --port 9869
• Playwright on http://localhost:9869:
  • /spool/print: visible pagination rendered, page 2 navigation worked, and the first row on page 2 was spool 52
  • /spool/print: searching Rack Alpha narrowed visible results to 30 and Select/Unselect All updated the counter to 30 spools selected
  • /spool/print: enabling archived rows and searching LOT-12 surfaced archived spool 12
  • /spool/print: table scroll height adjusted from 332px at a 620px viewport to 612px at a 900px viewport
  • /spool/print?spools=1&return=%2Fspool%2Fprint: selected spool 1 advanced into the print dialog
  • Malformed persisted state recovery:
    • bad savedStates-selectedPreset and savedStates-print-previewScale no longer crash the print dialog
    • bad spool-* localStorage values and bad #sorters/#filters/#pagination hash state no longer crash /spool

Test Checklist

• Search narrows the full spool dataset via the backend ?search= parameter
• Bulk select only affects the currently visible rows
• Pagination controls render and page navigation works
• Table height responds to viewport size
• Location and Lot Nr columns render in the selector
• Print flow advances from selector to dialog with selected spool IDs
• Malformed saved state recovers without crashing
• Multi-color preview was visually inspected in the browser
• No console errors on nested routes

Notes

• Direct nested-route loads still log an existing service-worker registration 404 for /spool/sw.js. That showed up during validation but is outside this PR's diff.