Many UX and correctness improvements

- Components URL reflects selected component (/components/:id), survives refresh
- Word-split search: "0603 res" matches "Resistor 0603"
- Left pane resizable with localStorage persistence
- Field values rendered via central render_field_value() (units, URLs, extensible)
- Fields sorted alphabetically in both detail view and edit dialog
- Edit component dialog widened; field rows use shared grid columns (table-like)
- No space between value and unit (supports prefix suffixes like k, M, µ)
- Grid viewer highlights and scrolls to cell when navigating from component detail
- Cell inventory overlay items are <a> tags — middle-click opens in new tab
- PDF files stored with sanitized human-readable filename, not random ID
- PDF rename also renames file on disk
- Atomic rename via renameat2(RENAME_NOREPLACE) through tools/mv-sync
- Fix .cell-thumb-link → .cell-thumb-preview (div, not anchor), cursor: zoom-in
- Fix field name overflow in detail view (auto column width, overflow-wrap)
- Fix link color: use --accent instead of browser default dark blue

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

tools/Makefile

@@ -0,0 +1,10 @@
+CC      = gcc
+CFLAGS  = -O2 -Wall -Wextra
+
+all: mv-sync
+
+mv-sync: mv-sync.c
+	$(CC) $(CFLAGS) -o mv-sync mv-sync.c
+
+clean:
+	rm -f mv-sync