fix(composer): consolidate chip-wrap flex rules per Copilot review

Copilot review on #2826 raised three points:

1. Five identical `flex: 0 0 auto` declarations across the chip-wrap
   selectors (profile / ws / reasoning / toolsets / model). The
   codebase already uses grouped selectors for shared rules — e.g.
   `.composer-left > .composer-model-wrap, .composer-left >
   .composer-reasoning-wrap, .composer-left >
   .composer-toolsets-wrap{display:none!important;}` at line 1817.
   Consolidated this PR's change to match.

2. `min-width: 0` is a no-op once `flex-shrink: 0` is set. Dropped it
   from all five wraps rather than leaving dead style.

3. CHANGELOG text said the overlap affected "profile / workspace /
   model / context-usage" chips, but `context-usage` is the separate
   `.ctx-indicator-wrap` ring, not `.composer-reasoning-wrap`.
   Rewrote the line to say "profile / workspace / model / reasoning"
   to match the actual class names and what the user sees.

No behavior change vs the previous commit on this PR — same selectors,
same final flex value. Just less duplication.

CHANGELOG.md

@@ -5,7 +5,7 @@
 
 ### Fixed
 
-- **Composer footer chip overlap at narrow widths** (#2740) — chip wraps (`.composer-profile-wrap`, `.composer-ws-wrap`, `.composer-model-wrap`, `.composer-reasoning-wrap`, `.composer-toolsets-wrap`) had `flex:0 1 auto`+`min-width:0` so they would compress past their content's natural width when the composer narrowed, causing the profile / workspace / model / context-usage chips to visually overlap. Switched to `flex:0 0 auto` so each chip keeps its natural width and the existing `overflow-x:auto` on `.composer-left` handles overflow via horizontal scroll. Default-width layout unchanged; only affects the overflow regime.
+- **Composer footer chip overlap at narrow widths** (#2740) — chip wraps (`.composer-profile-wrap`, `.composer-ws-wrap`, `.composer-model-wrap`, `.composer-reasoning-wrap`, `.composer-toolsets-wrap`) had `flex:0 1 auto`+`min-width:0` so they would compress past their content's natural width when the composer narrowed, causing the profile / workspace / model / reasoning chips to visually overlap. Switched to `flex:0 0 auto` for all five via a single grouped selector (no-op `min-width:0` dropped). Each chip now keeps its natural width and the existing `overflow-x:auto` on `.composer-left` handles overflow via horizontal scroll. Default-width layout unchanged; only affects the overflow regime.
 
 ## [v0.51.124] — 2026-05-24 — Release CV (stage-batch6 — 3-PR Windows-only stack — agent paths / docs / port hardening)
 

static/style.css

@@ -1377,7 +1377,16 @@
   .composer-left{display:flex;align-items:center;gap:4px;min-width:0;flex:1;overflow-x:auto;overflow-y:hidden;scrollbar-width:none;}
   .composer-left::-webkit-scrollbar{display:none;}
   .composer-divider{width:1px;height:16px;background:var(--border);margin:0 3px;flex-shrink:0;}
-  .composer-profile-wrap{position:relative;flex:0 0 auto;min-width:0;}
+  /* Composer footer chip wraps share position:relative + flex:0 0 auto so
+     they keep their natural width and let .composer-left handle overflow
+     via horizontal scroll. flex-shrink:0 here is what fixes #2740 (chips
+     were compressing past their content and visually overlapping). Each
+     wrap declares its own display / gap below as needed. */
+  .composer-profile-wrap,
+  .composer-ws-wrap,
+  .composer-reasoning-wrap,
+  .composer-toolsets-wrap,
+  .composer-model-wrap{position:relative;flex:0 0 auto;}
   .composer-profile-chip{display:inline-flex;align-items:center;gap:8px;max-width:180px;padding:8px 10px 8px 12px;border-radius:999px;border:1px solid transparent;background-color:transparent;font-weight:500;cursor:pointer;transition:color .15s,background-color .15s,border-color .15s;}
   .composer-profile-chip:hover{background-color:var(--hover-bg);}
   .composer-profile-chip.active{background:var(--accent-bg);border-color:var(--accent-bg-strong);}
@@ -1386,7 +1395,7 @@
   .composer-profile-chip.switching .composer-profile-icon{position:relative;}
   .composer-profile-icon,.composer-profile-chevron{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;line-height:1;}
   .composer-profile-label{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
-  .composer-ws-wrap{position:relative;flex:0 0 auto;min-width:0;display:flex;align-items:center;gap:4px;}
+  .composer-ws-wrap{display:flex;align-items:center;gap:4px;}
   .composer-workspace-group{display:inline-flex;align-items:stretch;max-width:284px;border-radius:999px;overflow:hidden;background-color:transparent;border:1px solid var(--border2);transition:background-color .15s,border-color .15s;}
   .composer-workspace-group:hover{background-color:var(--hover-bg);}
   .composer-workspace-group:hover{border-color:var(--border2);}
@@ -1401,7 +1410,6 @@
   .composer-workspace-chip.active{color:var(--text);background:var(--accent-bg);}
   .composer-workspace-icon,.composer-workspace-chevron{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;line-height:1;}
   .composer-workspace-label{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
-  .composer-reasoning-wrap{position:relative;flex:0 0 auto;min-width:0;}
   .composer-reasoning-chip{display:inline-flex;align-items:center;gap:8px;max-width:180px;padding:8px 10px 8px 12px;border-radius:999px;border:1px solid transparent;background-color:transparent;color:var(--muted);font-weight:500;cursor:pointer;transition:color .15s,background-color .15s,border-color .15s;}
   .composer-reasoning-chip.inactive{opacity:.78;}
   .composer-reasoning-chip:hover{color:var(--text);background-color:var(--hover-bg);}
@@ -1414,7 +1422,7 @@
   .reasoning-option:hover{background:rgba(255,255,255,.07);}
   .reasoning-option.selected{background:var(--accent-bg);}
   /* Toolsets chip — session-level toolset override (#493) */
-  .composer-toolsets-wrap{position:relative;flex:0 0 auto;min-width:0;display:none;}
+  .composer-toolsets-wrap{display:none;}
   .composer-toolsets-chip{display:inline-flex;align-items:center;gap:8px;max-width:180px;padding:8px 10px 8px 12px;border-radius:999px;border:1px solid transparent;background-color:transparent;color:var(--muted);font-weight:500;cursor:pointer;transition:color .15s,background-color .15s,border-color .15s;}
   .composer-toolsets-chip:hover{color:var(--text);background-color:var(--hover-bg);}
   .composer-toolsets-chip.active{color:var(--text);background:var(--accent-bg);border-color:var(--accent-bg);}
@@ -1435,7 +1443,6 @@
   .toolsets-apply-btn:hover{opacity:.9;}
   .toolsets-clear-btn{background:transparent;color:var(--muted);border:1px solid var(--border2);}
   .toolsets-clear-btn:hover{background:var(--hover-bg);color:var(--text);}
-  .composer-model-wrap{position:relative;flex:0 0 auto;min-width:0;}
   .composer-model-chip{display:inline-flex;align-items:center;gap:8px;max-width:280px;padding:8px 10px 8px 12px;border-radius:999px;border:1px solid transparent;background-color:transparent;color:var(--muted);font-weight:500;cursor:pointer;transition:color .15s,background-color .15s,border-color .15s;}
   .composer-model-chip:hover{color:var(--text);background-color:var(--hover-bg);}
   .composer-model-chip.active{color:var(--text);background:var(--accent-bg);border-color:var(--accent-bg);}