fix(map): keep Path Inspector candidates accessible and cover route replacement

[n30nex]

Fix

Fixes #2060. Fixes #2081.

Path Inspector route drawing and candidate replacement now have deterministic browser coverage. An idempotent SQL seed adds four synthetic repeaters and four edges after fixture migration, without changing packet ordering. The test uses the real API, normal clicks, visible Leaflet geometry, and removal of every previous route object.

Restoring coverage exposed a desktop layout bug: drawing the first route moved the map over the next candidate button. The route sidebar now participates in the existing flex layout, including resizing and collapse, while preserving the mobile bottom sheet.

The historical zero-candidate result did not reproduce on the current baseline. No search thresholds or API behavior changed. No new dependencies or customizer settings.

Validation

• Local assertion-red history: 042db2b requires seeded candidates; ca1d22a exposes the blocked second click. Subsequent commits repair layout and narrow-window behavior.
• All 183 standalone suites passed. Unchanged-base Go failures: test(server): node-path regressions race asynchronous index readiness #2083 readiness race (fixed in test(server): await indexes before node-path regression requests #2084) and Windows symlink privilege.
• Real Chromium: 11 Path Inspector/layout checks, 33 related map checks, and core E2E (131 passed, 3 existing fixture skips).
• CSS-variable checks, XSS diff check, inventory, whitespace and PII checks passed. Seed remains valid after periodic graph refresh.

Local browser validation used Chromium with a 60-second navigation budget; the OpenClaw profile and external preflight script were unavailable. Repository checks ran directly. CI run 36343343569 records the initial assertion-red commit. Final CI must pass before merge.

[n30nex]

Review feedback addressed (commit adfc1e6):

1. A saved 700px sidebar now yields space at 900px and 768px; native resize, collapse and restore are covered.
2. Both candidates must draw visible SVG segments at the expected coordinates, and switching removes every previous route object.
3. Mobile tests verify expanded and collapsed sheet/map geometry.

Parent validation: 183 standalone suites, 11 focused browser checks, 33 related map checks; core E2E 131 passed with 3 existing fixture skips. CI run 36343343569 confirmed the initial candidate-count assertion failed before the seed. The final-head CI run is pending.