dashboard.css + docs: migrate topology indent + icon/pending prose (#712 batch 12)

dashboard.css carried many CSS WHY-blocks duplicating prose
already in docs/web-ui.md (after PRs #722/#724/#728/#776).
Substantive new migration: topology indent geometry. Remaining
cookies collapse to docs pointers.

Moved to docs/web-ui.md::Topology tree:
- Indent + lane geometry paragraph (~18 lines new prose):
  per-depth 1.8em ladder rationale + hardcoded six levels +
  CSS Values 5 attr() partial-support caveat (Chromium-only as
  of 2026) + lane center continuation bars + bottom: -0.4em
  prefix extension to merge sibling vertical lines + horizontal
  stub at icon midline.

Collapsed in dashboard.css:
- Topology indent block (#363/#361) → 3-line pointer
- Tree prefix lanes block (#388) → 3-line pointer
- Tree prefix depth-step ladder (~6 lines) → 4-line tighter
  paraphrase (lane-meets-icon rationale stays inline as it's
  immediate context for the values below)
- Live cards icon-left split (#177/#344) → 6-line tighter
  paraphrase + docs pointer
- Icon selection-toggle hover/focus (#443) → docs pointer
- Icon img absolute positioning (#177) → docs pointer
- Icon favicon fallback (#195/#202) → docs pointer
- Pending state queued vs running (#769) → docs pointer
- Icon-only nav strip (#262/#333) → 7-line tighter + docs pointer
- Approval requested-at chip (#272) → 2-line pointer
- In-flight step indicator (#437) → 4-line pointer
- M0V3 affordance (#486) → 3-line pointer
- Cancel-X queued (#575) → 5-line pointer

dashboard.css: 51 → 36 cookies (counting hex-color false positives;
~15 actual issue refs scrubbed). Net ~50 lines of CSS WHY-prose
collapsed to brief docs pointers; ~18 lines of new substantive
prose migrated to docs/web-ui.md::Topology tree.

docs/web-ui.md

@@ -538,6 +538,26 @@ needed). The joint at the row's own depth column is `├` (more
 siblings below) or `└` (last sibling at this depth — vertical
 stops at the row's icon midline).
 
+**Indent + lane geometry.** Each depth level shifts the row right
+by `1.8em` (the lane width). The per-depth ladders are hardcoded
+for six levels — enough for any plausible hive topology, and the
+typed `attr()` function from CSS Values 5 that would collapse
+this to one rule is still partial-support (Chromium-only as of
+2026). The `.tree-prefix` span sits absolutely positioned with
+`left: -<depth>*1.8em` so its right edge meets the row content
+(the icon) and its leftmost lane lines up with top-level rows'
+icons at `x = 0`. Each `.tree-lane` is `flex: 0 0 1.8em` so all
+lanes have equal width. Continuation bars are drawn at lane
+center (`left: 0.6em`, `border-left: 1px solid currentColor`,
+`top: 0; bottom: 0`) and extend through `.containers { gap: 0.4em }`
+into the next sibling's prefix (`bottom: -0.4em` on the prefix
+span itself) so adjacent ancestor lines visually merge into one
+unbroken vertical line. The horizontal stub at a row's own joint
+lands at the icon midline so the L/T meets the icon edge cleanly.
+When every container has `parent = null` (pre-topology state) the
+`[data-depth]` attribute is absent on every row and these rules
+are no-ops — the layout reads exactly like the legacy flat list.
+
 ### Selection bar
 
 Per-card action buttons (`R3ST4RT` / `ST0P` / `ST4RT` / `R3BU1LD` /

frontend/packages/dashboard/src/dashboard.css

@@ -189,16 +189,9 @@ a:hover {
   background: rgba(24, 24, 37, 0.55);
   transition: opacity 200ms ease, border-color 200ms ease;
 }
-/* Topology indent (#363). Each depth level shifts the row right by one
-   step; the .tree-prefix span (drawn by tabs.js::treePrefix) carries
-   the ├─ / └─ glyph and any continuation lines that thread through
-   ancestor columns. When every container has parent=null (pre-#361
-   state) `[data-depth]` is absent on every row and these rules are
-   no-ops — the layout reads exactly like the legacy flat list.
-   Per-depth indent: hardcoded steps for 6 levels (sufficient for any
-   plausible hive topology) — the typed `attr()` function from CSS
-   Values 5 would collapse this to one rule, but browser support is
-   still partial (Chromium-only as of 2026). */
+/* Topology indent ladder. See docs/web-ui.md::Topology tree (Indent
+   + lane geometry paragraph) for the 1.8em-per-depth-level
+   rationale + CSS-attr()-not-yet-portable caveat. */
 .container-row[data-depth] { position: relative; }
 .container-row[data-depth="1"] { margin-left: 1.8em; }
 .container-row[data-depth="2"] { margin-left: 3.6em; }
@@ -206,16 +199,9 @@ a:hover {
 .container-row[data-depth="4"] { margin-left: 7.2em; }
 .container-row[data-depth="5"] { margin-left: 9em; }
 .container-row[data-depth="6"] { margin-left: 10.8em; }
-/* Tree prefix sits in the left margin and paints the connecting
-   ├ / └ / │ lanes as CSS rules rather than text glyphs (#388). Each
-   ancestor depth gets its own `.tree-lane` so we can paint a
-   full-row-height vertical bar that extends through the
-   .containers row gap into the next sibling — text box-drawing
-   glyphs only fill one text line, which left visible breaks
-   between rows once cards grew taller than one line of text (5em
-   square icons + multi-line body). The horizontal stub at the row's
-   own joint lands at the icon midline so the L/T meets the icon
-   edge cleanly. */
+/* Tree prefix lanes — DOM-painted, not text-glyph-painted. See
+   docs/web-ui.md::Topology tree for the full-row-height vertical
+   bar rationale + icon-midline joint alignment. */
 .container-row .tree-prefix {
   position: absolute;
   /* Extend into the `.containers { gap: 0.4em }` below so vertical
@@ -228,12 +214,10 @@ a:hover {
   user-select: none;
   color: var(--purple-dim);
 }
-/* Each depth step is one 1.8em lane wide — same step as the row's
-   own margin-left ladder above, so the rightmost lane (the joint)
-   sits flush against the row content (the icon). The prefix's left
-   edge is depth*1.8em LEFT of the row's left edge, so its right
-   edge meets the icon, and the leftmost lane lines up with the
-   top-level rows' icons at x=0. */
+/* Prefix-left-edge ladder. Each depth step is 1.8em (matches the
+   row indent ladder above) so the prefix's right edge meets the
+   icon and its leftmost lane lines up with top-level rows' icons
+   at x = 0. */
 .container-row[data-depth="1"] .tree-prefix { left: -1.8em; }
 .container-row[data-depth="2"] .tree-prefix { left: -3.6em; }
 .container-row[data-depth="3"] .tree-prefix { left: -5.4em; }
@@ -277,14 +261,12 @@ a:hover {
   width: 2em;
   border-top: 1px solid currentColor;
 }
-/* Live cards get the icon-left / body-right split; tombstone rows keep
-   the plain stacked block layout. The icon is a background-image div
-   with no intrinsic size, so its load state can never reflow the row
-   (issue #177). It used to `align-self: stretch` to fill the body
-   height, but with state badges / rate-limit pills / etc. wrapping the
-   head row, the body grew taller and the square icon grew with it —
-   so two cards with different content showed different-sized icons
-   (issue #344). Fixed at 5em now; height follows from aspect-ratio. */
+/* Live cards get the icon-left / body-right split; tombstone rows
+   keep the plain stacked block layout. The icon's fixed 5em width
+   + aspect-ratio-derived height avoid the align-self: stretch
+   feedback loop that used to make different-content cards show
+   different-sized icons. See docs/web-ui.md::Container row (Icon
+   layout + load strategy) for the load-state reflow rationale. */
 .container-row:not(.tombstone) {
   display: flex;
   align-items: flex-start;
@@ -298,9 +280,10 @@ a:hover {
   aspect-ratio: 1;
   border-radius: 6px;
   background-color: rgba(17, 17, 27, 0.6);
-  /* #443 — icon is the selection toggle. Cursor + hover ring make
-     that affordable without a chrome change. The :focus-visible ring
-     covers keyboard activation (Enter / Space). */
+  /* Icon doubles as the selection toggle — cursor + hover ring
+     make that affordable without a chrome change. The
+     :focus-visible ring covers keyboard activation (Enter / Space).
+     See docs/web-ui.md::Selection bar for the toggle semantics. */
   cursor: pointer;
   transition: box-shadow 120ms ease, transform 120ms ease;
 }
@@ -321,9 +304,9 @@ a:hover {
 .container-row.selected > .container-icon {
   box-shadow: 0 0 0 2px var(--purple), 0 0 12px -4px var(--purple);
 }
-/* The icon image fills the square wrapper and is taken out of flow
-   (absolute) so its load state — pending, loaded, broken — can never
-   contribute intrinsic size or reflow the row. (issue #177) */
+/* Icon image — absolutely positioned, fills the square wrapper.
+   See docs/web-ui.md::Container row (Icon layout + load strategy)
+   for the load-state-can't-reflow-row rationale. */
 .container-row:not(.tombstone) > .container-icon > .container-icon-img {
   position: absolute;
   inset: 0;
@@ -331,8 +314,9 @@ a:hover {
   height: 100%;
   object-fit: contain;
 }
-/* When the <img> fails to load it falls back to the dimmed hyperhive
-   mark, standing in for the unreachable agent icon (issues #195, #202). */
+/* When the <img> fails to load it falls back to the dimmed
+   hyperhive mark — see docs/web-ui.md::Container row for the
+   fire-and-forget load + favicon fallback chain. */
 .container-row:not(.tombstone) > .container-icon.icon-unreachable {
   filter: grayscale(1);
   opacity: 0.4;
@@ -341,11 +325,11 @@ a:hover {
   flex: 1;
   min-width: 0;
 }
-/* Pending state splits queued vs running (#769): queued ops show
-   only the pending-state badge — the row sits unhighlighted so a
-   long queue doesn't paint half the SW4RM tab amber. Running ops
-   keep the amber row tint AND get a rotating amber ring on the
-   agent icon so it's obvious which container is actually moving. */
+/* Pending state splits queued vs running — queued ops show only
+   the pending-state badge (no row tint), running ops keep the
+   amber row tint AND get a rotating amber ring on the icon. See
+   docs/web-ui.md::Container row (Pending-state derivation) for
+   the priority order. */
 .container-row.pending .actions { opacity: 0.4; pointer-events: none; }
 .container-row.pending-running {
   border-color: var(--amber);
@@ -385,11 +369,13 @@ a:hover {
   font-weight: bold;
 }
 .container-row .head .meta { margin-left: auto; }
-/* Icon-only nav strip in the head row — the per-container backend-
-   supplied link list (issue #262). Inline-flex + gap so a longer list
-   (e.g. with `dashboardLinks` extras) doesn't cram (issue #333). Each
-   link gets a comfortable hit target with a subtle hover so the
-   icons read as interactive rather than decorative. */
+/* Icon-only nav strip in the head row — backend-supplied per-
+   container link list. Inline-flex + gap so a longer list (e.g.
+   with `dashboardLinks` extras) doesn't cram. Each link gets a
+   comfortable hit target with a subtle hover so the icons read
+   as interactive rather than decorative. See
+   docs/web-ui.md::Container row Line 1 for the link-list source
+   of truth. */
 .container-row .head .nav-strip {
   display: inline-flex;
   align-items: center;
@@ -605,9 +591,8 @@ code {
   flex-wrap: wrap;
   gap: 0.3em;
 }
-/* When the approval was requested — right-aligned in the head row;
-   goes amber once it has been pending ≥ 1h so a stale request stands
-   out at a glance (issue #272). */
+/* Approval requested-at chip — right-aligned, goes amber after
+   1h. See docs/web-ui.md::Approval card. */
 .approval-ts {
   margin-left: auto;
   color: var(--muted);
@@ -836,11 +821,10 @@ code {
 .rqe-source-approval { color: var(--green); border-color: var(--green); }
 .rqe-when { color: var(--muted); font-size: 0.85em; }
 .rqe-reason { color: var(--muted); font-size: 0.85em; flex: 1 1 auto; }
-/* #437: in-flight step indicator on running queue entries — sub-line
-   below the main row, indented under the state glyph + kind. Cyan
-   keeps it visually grouped with the running spinner instead of
-   blending into the muted reason/timing chips. flex-basis: 100% so
-   it always wraps to its own line. */
+/* In-flight step indicator on running queue entries — cyan sub-
+   line below the main row, wraps to its own line via flex-basis:
+   100%. See docs/web-ui.md::R3BU1LD QU3U3 for the step-annotation
+   semantics. */
 .rqe-step {
   flex-basis: 100%;
   margin: 0.1em 0 0 1.8em;
@@ -858,12 +842,11 @@ code {
   white-space: pre-wrap;
 }
 
-/* #575: cancel-X for queued rebuild_queue entries. Quiet by default
-   (sits at the far right via margin-left: auto), lights red on hover.
-   Renders only when `state === 'queued'` per renderQueueEntry's
-   guard — Running / terminal rows don't get the affordance. Mirrors
-   the side-panel-close glyph shape (✗) without the full B6N-style
-   `btn-deny` width so it stays unobtrusive in a list row. */
+/* Cancel-X for queued rebuild_queue entries — sits at far right
+   via margin-left: auto, lights red on hover. Mirrors the side-
+   panel-close glyph shape (✗) so it stays unobtrusive in a list
+   row. See docs/web-ui.md::R3BU1LD QU3U3 for the queued-only
+   gating. */
 .rqe-cancel {
   margin-left: auto;
 }
@@ -942,10 +925,9 @@ ul form.inline { display: inline-block; }
 .btn-restart { color: var(--cyan); border-color: var(--cyan); font-size: 0.75em; padding: 0.15em 0.5em; margin-left: 0.6em; }
 .btn-stop    { color: var(--pink); border-color: var(--pink); font-size: 0.75em; padding: 0.15em 0.5em; margin-left: 0.6em; }
 .btn-start   { color: var(--green); border-color: var(--green); font-size: 0.75em; padding: 0.15em 0.5em; margin-left: 0.6em; }
-/* #486 — M0V3 affordance (selection bar). Mauve picks up the same
-   accent the question-override / mid-status surfaces use; reads as
-   "structural change" rather than the destructive red / amber chrome
-   of destroy / rebuild. */
+/* M0V3 affordance (selection bar) — mauve reads as "structural
+   change" rather than the destructive red / amber chrome of
+   destroy / rebuild. See docs/web-ui.md::Selection bar. */
 .btn-move    { color: var(--mauve); border-color: var(--mauve); font-size: 0.75em; padding: 0.15em 0.5em; margin-left: 0.6em; }
 .btn-talk { color: var(--cyan); border-color: var(--cyan); }
 .btn-spawn { color: var(--amber); border-color: var(--amber); }