feat: legibility — conditions, hints, kinder errors (Workstream B)

GET /api/conditions surfaces what the backend already computes: moon
phase, veil thinness, geomagnetic state — junk lon degrades to moon-only
instead of a 422, missing NOAA data means fewer lines, never an error.
VeilConditions renders it in the séance side column, polling every 10 min.

ModeHint: one in-fiction line per mode after 15s of an unused sensor,
dismissed forever via localStorage. Error copy in evp/radio now
detect-and-redirects (mic denied -> 'the board needs no ear'; no WebUSB
-> try EVP) instead of dead-ending.

No geolocation prompt from the conditions strip — asking for location
from a passive readout would be hostile; ?lon= stays supported for
callers that have it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

# Conflicts:
#	frontend/src/pages/SeancePage.tsx

frontend/src/i18n/en.json

@@ -155,12 +155,40 @@
       "line": "⚡ {{source}} {{frequency}} +{{magnitude}}dB",
       "count": "{{count}} anomalies witnessed this session"
     },
+    "hints": {
+      "wire": "the wire whispers on its own when you listen passively",
+      "evp": "the veil listens through your microphone — grant it your ear",
+      "radio": "a tuner in the hand hears further than the wire",
+      "ouija": "ask below, or let the board drift",
+      "emf": "hold still; the field remembers movement"
+    },
+    "conditions": {
+      "title": "VEIL CONDITIONS",
+      "lit": "{{percent}}% lit",
+      "veil": {
+        "thin": "the veil runs thin tonight",
+        "veiled": "the veil hangs, neither open nor shut",
+        "heavy": "the veil lies heavy"
+      },
+      "fieldQuiet": "field: quiet",
+      "fieldStorm": "geomagnetic storm",
+      "moon": {
+        "new_moon": "new moon",
+        "waxing_crescent": "waxing crescent",
+        "first_quarter": "first quarter",
+        "waxing_gibbous": "waxing gibbous",
+        "full_moon": "full moon",
+        "waning_gibbous": "waning gibbous",
+        "last_quarter": "last quarter",
+        "waning_crescent": "waning crescent"
+      }
+    },
     "evp": {
       "start": "open the microphone",
       "stop": "close the microphone",
       "listening": "listening to the voice band…",
       "deniedTitle": "the microphone stays shut",
-      "denied": "This vessel refused the microphone. Grant audio permission in your browser to practice EVP — or let the Wire Ghost listen instead; it needs nothing but the network you already fear.",
+      "denied": "This vessel refused the microphone. Grant audio permission in your browser's site settings to practice EVP — or turn to the ouija board or the Wire Ghost instead; the board needs no ear, and the wire only the network you already fear.",
       "floor": "room floor",
       "band": "voice band 300–3400 Hz",
       "scopeLabel": "live audio spectrum from the microphone"
@@ -169,7 +197,7 @@
       "start": "sweep the band",
       "stop": "rest the needle",
       "unsupportedTitle": "this vessel cannot hear the radio dead",
-      "unsupported": "Spirit Radio needs Chromium (WebUSB) and an RTL-SDR dongle. The other modes do not — the wire and the microphone still answer.",
+      "unsupported": "Spirit Radio needs Chromium (WebUSB) and an RTL-SDR dongle. The other modes still answer — EVP hears through the microphone you already carry, and the wire needs nothing at all.",
       "troubleshoot": "troubleshooting: chromium-based browser · udev rules for 0bda:2838 · the dongle plugged in, not merely believed in",
       "insecure": "the radio dead only speak through consecrated ground — open this site via its https address.",
       "insecureHint": "localhost counts as hallowed; a bare http://lan-ip does not.",