style(ui): simplify Company Environments screen copy (#8400)

## Thinking Path

> - Paperclip is the control plane for managing AI-agent work, and the
UI needs to stay legible because operators use it to steer execution.
> - This change sits in the Company Environments screen inside the
Paperclip app UI.
> - The screen carried redundant headings and several overlapping helper
sentences that added clutter without adding meaning.
> - The request was presentation-only: remove redundant copy and
simplify labels, with no change to environment-selection behavior.
> - The safest path was a single-file edit in `CompanyEnvironments.tsx`
that preserved every control and only removed/renamed text.
> - This is a `style:` change (UI copy/presentation), so no behavior is
altered and no new test is warranted.

## Linked Issues or Issue Description

No public GitHub issue exists for this small UI cleanup, so the problem
is described here instead.

- The Company Environments screen had redundant headings and overlapping
helper copy.
- The default environment control used a verbose label and a Local
option label that added noise without adding meaning.
- Requested outcome: simplify the copy so the screen is easier to scan
while preserving the same behavior.

Related public PRs reviewed for overlap:
- Refs #8380
- Refs #8391
- Refs #8398
- Refs #4902

## What Changed

- Removed the extra top-level `Environments` header inside the screen
content (both enabled and disabled states).
- Removed the introductory paragraph above the environment list.
- Renamed `Instance default environment` to `Default` and removed its
helper sentence.
- Removed the duplicate helper text below the default environment
select.
- Changed `Local (built-in default)` to `Local`.
- Removed the redundant `Saved environments` section heading.
- Removed the empty-state line `No saved environments yet. Local remains
the default until you add another target.`
- Removed the previously added UI test, which only asserted the
now-final copy and added no lasting value.
- Removed the now-unused `Settings` import and
`instanceDefaultEnvironment` variable.

## Verification

- Ran the existing `CompanyEnvironments` vitest suite locally: 4 passed.
- This is a presentation-only copy change with no API, state, or
behavior changes.
- Reviewer can open Company Settings -> Environments and confirm the
screen matches the requested wording cleanup with no behavior change.

## Risks

- Low. Copy-only UI change with no API or state-management changes.
- The only real risk is removing more context than intended from the top
of the screen; review should focus on clarity.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- Anthropic Claude Opus 4.8 via the Claude local adapter with tool use
in a Paperclip-managed workspace.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [ ] My branch name describes the change and contains no internal
Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] This is a `style:` copy-only change; no new test is warranted
(test-coverage gate skips `style:`)
- [ ] If this change affects the UI, I have included before/after
screenshots
- [x] I have considered and documented any risks above
- [ ] All Paperclip CI gates are green
- [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge

ui/src/pages/CompanyEnvironments.tsx

@@ -6,7 +6,6 @@ import {
   type EnvironmentProbeResult,
   type JsonSchema,
 } from "@paperclipai/shared";
-import { Settings } from "lucide-react";
 import { environmentsApi } from "@/api/environments";
 import { instanceSettingsApi } from "@/api/instanceSettings";
 import { secretsApi } from "@/api/secrets";
@@ -476,8 +475,6 @@ export function CompanyEnvironments() {
     instanceSettings?.defaultEnvironmentId ?? null,
     savedEnvironments,
   );
-  const instanceDefaultEnvironment =
-    nonLocalEnvironments.find((environment) => environment.id === instanceDefaultEnvironmentId) ?? null;
 
   if (!selectedCompanyId) {
     return <div className="text-sm text-muted-foreground">Select a company context to manage environment secrets and bindings.</div>;
@@ -486,10 +483,6 @@ export function CompanyEnvironments() {
   if (!environmentsEnabled) {
     return (
       <div className="max-w-3xl space-y-4">
-        <div className="flex items-center gap-2">
-          <Settings className="h-5 w-5 text-muted-foreground" />
-          <h1 className="text-lg font-semibold">Environments</h1>
-        </div>
         <div className="rounded-md border border-border px-4 py-4 text-sm text-muted-foreground">
           Enable Environments in instance experimental settings to manage shared execution targets.
         </div>
@@ -499,24 +492,11 @@ export function CompanyEnvironments() {
 
   return (
     <div className="max-w-5xl space-y-6" data-testid="instance-settings-environments-section">
-      <div className="space-y-2">
-        <div className="flex items-center gap-2">
-          <Settings className="h-5 w-5 text-muted-foreground" />
-          <h1 className="text-lg font-semibold">Environments</h1>
-        </div>
-        <p className="max-w-3xl text-sm text-muted-foreground">
-          Define reusable execution targets for the instance. The built-in default is <span className="font-medium text-foreground">Local</span>; agents inherit that unless the instance default or an agent override points somewhere else.
-        </p>
-      </div>
-
       <div className="space-y-4 rounded-md border border-border px-4 py-4">
         <div className="rounded-md border border-border/60 bg-muted/20 px-3 py-3">
           <div className="flex flex-wrap items-start justify-between gap-3">
             <div className="space-y-1">
-              <div className="text-sm font-medium">Instance default environment</div>
+              <div className="text-sm font-medium">Default</div>
-              <div className="text-xs text-muted-foreground">
-                New agent configurations inherit this target unless they explicitly override it.
-              </div>
             </div>
             <div className="min-w-[18rem] flex-1">
               <select
@@ -526,33 +506,24 @@ export function CompanyEnvironments() {
                   defaultEnvironmentMutation.mutate(event.target.value || null)}
                 disabled={defaultEnvironmentMutation.isPending}
               >
-                <option value="">Local (built-in default)</option>
+                <option value="">Local</option>
                 {nonLocalEnvironments.map((environment) => (
                   <option key={environment.id} value={environment.id}>
                     {environment.name} · {environment.driver}
                   </option>
                 ))}
               </select>
-              <div className="mt-1 text-[11px] text-muted-foreground">
-                {instanceDefaultEnvironment
-                  ? `Agents currently inherit ${instanceDefaultEnvironment.name} unless they override it.`
-                  : "Agents currently inherit the built-in Local environment unless they override it."}
-              </div>
             </div>
           </div>
         </div>
 
         <div className="space-y-3">
-          <div className="flex flex-wrap items-center justify-between gap-3">
+          <div className="flex justify-end">
-            <div className="text-sm font-medium">Saved environments</div>
             <Button size="sm" onClick={handleStartCreateEnvironment}>
               Add environment
             </Button>
           </div>
-          {savedEnvironments.length === 0 ? (
+          {savedEnvironments.map((environment) => {
-            <div className="text-sm text-muted-foreground">No saved environments yet. Local remains the default until you add another target.</div>
-          ) : (
-            savedEnvironments.map((environment) => {
             const probe = probeResults[environment.id] ?? null;
             const isEditing = editingEnvironmentId === environment.id;
             return (
@@ -628,8 +599,7 @@ export function CompanyEnvironments() {
                 ) : null}
               </div>
             );
-            })
+          })}
-          )}
         </div>
       </div>