feat(ui/filters): searchable filter dropdown + bulk selection + query responsiveness

[akira69]

Summary

This PR makes the filament and spool list filters easier to use on larger datasets:

• searchable filter popovers
• Select All, Select None, and Clear for the visible filter options
• backend search/index support to keep the affected list paths responsive

Review cleanup also carried forward the PR861 malformed-saved-state hardening into useSavedState, and removed split contamination that did not belong in this PR (spoolman/import_externaldb.py and a stray spool_count locale entry).

What Changed

• Added searchable dropdown filtering to the affected table filters.
• Added bulk filter actions that operate on the currently visible searched options.
• Added backend search/query plumbing plus additive filament/spool search indexes.
• Added /filament-name so the UI can populate filament-name filters without fetching full filament rows.
• Guarded useSavedState parsing so malformed persisted state falls back to defaults and self-heals on reload.
• Removed unrelated split artifacts from this branch.

Database Impact

• Adds Alembic index migrations:
  • b76f1b4c3f5a (filament/vendor search indexes)
  • f1a3d9c2c4e1 (spool search indexes)
• Migration type: additive indexes only.
• No destructive schema or data rewrite.

Testing Performed

• cd client && ./node_modules/.bin/eslint src/components/column.tsx src/components/otherModels.tsx src/utils/filtering.ts src/utils/saveload.ts
• cd client && ./node_modules/.bin/prettier --check src/components/column.tsx src/components/otherModels.tsx src/utils/filtering.ts src/utils/saveload.ts public/locales/en/common.json
• uv run ruff check spoolman/api/v1/filament.py spoolman/api/v1/other.py spoolman/api/v1/spool.py spoolman/database/filament.py spoolman/database/spool.py spoolman/database/utils.py migrations/versions/2026_02_11_1700-b76f1b4c3f5a_filament_search_indexes.py migrations/versions/2026_02_11_1710-f1a3d9c2c4e1_spool_search_indexes.py
• cd client && npm ci && VITE_APIURL=/api/v1 npm run build
• Local runtime: cd /Users/dfinch/Code/Spoolman_Labels/worktrees/pr862 && PATH=.venv/bin:$PATH SPOOLMAN_DIR_DATA=/tmp/spoolman_pr_862_data uv run uvicorn spoolman.main:app --host 0.0.0.0 --port 9862
• Playwright on http://localhost:9862
  • seeded local vendor/filament/spool rows through the local API
  • verified filament manufacturer filter search narrows options
  • verified filament manufacturer Select All filters the table to the visible searched option
  • verified filament manufacturer Select None removes the searched selection and restores the full row set
  • verified filament material filter search plus Select All
  • verified filament material Clear
  • verified a selected material filter persists across reload and clears back to the full row set
  • verified spool filter search by vendor text plus Select All
  • injected malformed savedStates-spoolList-showArchived localStorage and verified the spool page still loaded and the saved state healed back to false
• Observed PR862 startup migrations applying on the local PR DB:
  • b76f1b4c3f5a
  • f1a3d9c2c4e1

Test Checklist

• Filament manufacturer filter search narrows the visible options
• Select All checks all currently visible options and filters the filament list accordingly
• Select None unchecks the currently visible searched option and restores the full filament row set
• Clear removes the selected material filter values and restores the full filament row set
• Selected material filter state persists across reload
• Spool filter search can match vendor text and filter to the expected spool row
• Malformed persisted savedStates-spoolList-showArchived state recovers without blanking the page
• Frontend build succeeds with VITE_APIURL=/api/v1
• Ruff check passes on the backend search/index files
• Alembic migrations apply on local startup for the PR862 database
• Backend query responsiveness was profiled with 100+ rows
• The invalid column-id guard was directly exercised with a malformed table-state payload