Add SI value sorting to parts: parse Ohms/Farads/Henrys/Hz numerically

- New value_numeric column (double precision) stores parsed base-SI value
- parseValueNumeric() handles SI prefixes (p/n/µ/m/k/M/G) for F, H, Ω, Hz
- Computed on save in new/edit actions
- List page sortable by value_numeric (sorts within category, nulls last)
- Sort toggle added to filter bar

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

drizzle/migrations/0001_rainy_rictor.sql

@@ -0,0 +1 @@
+ALTER TABLE "parts" ADD COLUMN "value_numeric" double precision;

drizzle/migrations/meta/_journal.json

@@ -8,6 +8,13 @@
       "when": 1782725202288,
       "tag": "0000_clear_sister_grimm",
       "breakpoints": true
+    },
+    {
+      "idx": 1,
+      "version": "7",
+      "when": 1782726648360,
+      "tag": "0001_rainy_rictor",
+      "breakpoints": true
     }
   ]
 }