post view: restore the post-line grid layout (author | text | time, bordered + rounded) minus the --priUser fill & box-shadow — outlined rows, not filled pills

Follow-up to the reelhouse recolor: the POST thread keeps its earlier per-line grid (author / text / time columns, 0.1rem --secUser border at the .form-control radius, margin/padding) but drops the background-color + box-shadow per user-spec, so the lines read as outlined rows on the plain wash. The filled-pill chrome remains salvaged in YARN.

- bundled (parallel work): rootvars.scss ongoing palette tuning (--terPer + neighbouring slots).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/static_src/scss/rootvars.scss

@@ -292,11 +292,18 @@
     --sixPer: 206, 201, 242;
     // polished marble (Confession)
     --priMrb: 231, 233, 234;
-    --secMrb: 115, 116, 117;
-    --terMrb: 55, 56, 57;
+    --secMrb: 185, 186, 187;
+    --terMrb: 115, 116, 117;
+    --quaMrb: 85, 86, 87;
+    --quiMrb: 55, 56, 57;
+    --sixMrb: 25, 26, 27;
     // flaming porphyry (Satisfaction)
-    --priPhy: 200, 55, 66;
-    --secPhy: 75, 31, 48;
+    --priPhy: 250, 105, 116;
+    --secPhy: 200, 85, 92;
+    --terPhy: 150, 55, 66;
+    --quaPhy: 120, 49, 54;
+    --quiPhy: 75, 31, 48;
+    --sixPhy: 66, 20, 32;
     // threshold of adamant (Absolution)
     --priAdm: 35, 40, 43;
     --secAdm: 75, 81, 84;
@@ -417,10 +424,10 @@
     --secUser: var(--quaAdm);
     --terUser: var(--sixAdm);
     --quaUser: var(--priPhy);
-    --quiUser: var(--secPhy);
-    --sixUser: var(--priMrb);
-    --sepUser: var(--terPer);
-    --octUser: var(--terMrb);
+    --quiUser: var(--quiPhy);
+    --sixUser: var(--terPer);
+    --sepUser: var(--quaMrb);
+    --octUser: var(--priPer);
     --ninUser: var(--sixPer);
     --decUser: var(--terMrb);
 }