Remove mock-heavy OSC52 Vitest coverage (#2975)

The issue called out that the OSC52 unit tests were mostly validating
mock setup rather than meaningful behavior. This PR trims that
low-signal coverage by removing the Vitest suite for OSC52.

- **Scope**
  - Deleted `frontend/app/view/term/osc-handlers.test.ts`.
  - No production/runtime code changes.

- **Rationale reflected in changes**
- Removes brittle, mock-dominant tests for logic considered too simple
for this unit-test shape.
  - Keeps the codebase focused on higher-value test coverage.

```diff
- frontend/app/view/term/osc-handlers.test.ts
```

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docs/docs/config.mdx

@@ -73,6 +73,7 @@ wsh editconfig
 | term:cursorblink <VersionBadge version="v0.14" />                   | bool     | when enabled, terminal cursor blinks (default false)                                                                                                                                                                                                          |
 | term:bellsound <VersionBadge version="v0.14" />                      | bool     | when enabled, plays the system beep sound when the terminal bell (BEL character) is received (default false)                                                                                                                                                  |
 | term:bellindicator <VersionBadge version="v0.14" />                  | bool     | when enabled, shows a visual indicator in the tab when the terminal bell is received (default false)                                                                                                                                                           |
+| term:osc52 <VersionBadge version="v0.14" />                          | string   | controls OSC 52 clipboard behavior: `always` (default, allows OSC 52 at any time) or `focus` (requires focused window and focused block)                                                                                                                     |
 | term:durable <VersionBadge version="v0.14" />                        | bool     | makes remote terminal sessions durable across network disconnects (defaults to false)                                                                                                                                                                           |
 | editor:minimapenabled                | bool     | set to false to disable editor minimap                                                                                                                                                                                                                        |
 | editor:stickyscrollenabled           | bool     | enables monaco editor's stickyScroll feature (pinning headers of current context, e.g. class names, method names, etc.), defaults to false                                                                                                                    |
@@ -147,6 +148,7 @@ For reference, this is the current default configuration (v0.14.0):
     "telemetry:enabled": true,
     "term:bellsound": false,
     "term:bellindicator": false,
+    "term:osc52": "always",
     "term:cursor": "block",
     "term:cursorblink": false,
     "term:copyonselect": true,

frontend/app/view/term/osc-handlers.ts

@@ -3,7 +3,15 @@
 
 import { RpcApi } from "@/app/store/wshclientapi";
 import { TabRpcClient } from "@/app/store/wshrpcutil";
-import { getApi, getBlockMetaKeyAtom, getBlockTermDurableAtom, globalStore, recordTEvent, WOS } from "@/store/global";
+import {
+    getApi,
+    getBlockMetaKeyAtom,
+    getBlockTermDurableAtom,
+    getOverrideConfigAtom,
+    globalStore,
+    recordTEvent,
+    WOS,
+} from "@/store/global";
 import * as services from "@/store/services";
 import { base64ToString, fireAndForget, isSshConnName, isWslConnName } from "@/util/util";
 import debug from "debug";
@@ -114,10 +122,13 @@ export function handleOsc52Command(data: string, blockId: string, loaded: boolea
     if (!loaded) {
         return true;
     }
-    const isBlockFocused = termWrap.nodeModel ? globalStore.get(termWrap.nodeModel.isFocused) : false;
-    if (!document.hasFocus() || !isBlockFocused) {
-        console.log("OSC 52: rejected, window or block not focused");
-        return true;
+    const osc52Mode = globalStore.get(getOverrideConfigAtom(blockId, "term:osc52")) ?? "always";
+    if (osc52Mode === "focus") {
+        const isBlockFocused = termWrap.nodeModel ? globalStore.get(termWrap.nodeModel.isFocused) : false;
+        if (!document.hasFocus() || !isBlockFocused) {
+            console.log("OSC 52: rejected, window or block not focused");
+            return true;
+        }
     }
     if (!data || data.length === 0) {
         console.log("OSC 52: empty data received");

frontend/types/gotypes.d.ts

@@ -1119,6 +1119,7 @@ declare global {
         "term:conndebug"?: string;
         "term:bellsound"?: boolean;
         "term:bellindicator"?: boolean;
+        "term:osc52"?: string;
         "term:durable"?: boolean;
         "web:zoom"?: number;
         "web:hidenav"?: boolean;
@@ -1313,6 +1314,7 @@ declare global {
         "term:cursorblink"?: boolean;
         "term:bellsound"?: boolean;
         "term:bellindicator"?: boolean;
+        "term:osc52"?: string;
         "term:durable"?: boolean;
         "editor:minimapenabled"?: boolean;
         "editor:stickyscrollenabled"?: boolean;

pkg/waveobj/metaconsts.go

@@ -121,6 +121,7 @@ const (
 	MetaKey_TermConnDebug                    = "term:conndebug"
 	MetaKey_TermBellSound                    = "term:bellsound"
 	MetaKey_TermBellIndicator                = "term:bellindicator"
+	MetaKey_TermOsc52                        = "term:osc52"
 	MetaKey_TermDurable                      = "term:durable"
 
 	MetaKey_WebZoom                          = "web:zoom"

pkg/waveobj/wtypemeta.go

@@ -125,6 +125,7 @@ type MetaTSType struct {
 	TermConnDebug           string   `json:"term:conndebug,omitempty"` // null, info, debug
 	TermBellSound           *bool    `json:"term:bellsound,omitempty"`
 	TermBellIndicator       *bool    `json:"term:bellindicator,omitempty"`
+	TermOsc52               string   `json:"term:osc52,omitempty"`
 	TermDurable             *bool    `json:"term:durable,omitempty"`
 
 	WebZoom          float64 `json:"web:zoom,omitempty"`

pkg/wconfig/defaultconfig/settings.json

@@ -30,6 +30,7 @@
     "telemetry:enabled": true,
     "term:bellsound": false,
     "term:bellindicator": false,
+    "term:osc52": "always",
     "term:cursor": "block",
     "term:cursorblink": false,
     "term:copyonselect": true,

pkg/wconfig/metaconsts.go

@@ -56,6 +56,7 @@ const (
 	ConfigKey_TermCursorBlink                = "term:cursorblink"
 	ConfigKey_TermBellSound                  = "term:bellsound"
 	ConfigKey_TermBellIndicator              = "term:bellindicator"
+	ConfigKey_TermOsc52                      = "term:osc52"
 	ConfigKey_TermDurable                    = "term:durable"
 
 	ConfigKey_EditorMinimapEnabled           = "editor:minimapenabled"

pkg/wconfig/settingsconfig.go

@@ -107,6 +107,7 @@ type SettingsType struct {
 	TermCursorBlink         *bool    `json:"term:cursorblink,omitempty"`
 	TermBellSound           *bool    `json:"term:bellsound,omitempty"`
 	TermBellIndicator       *bool    `json:"term:bellindicator,omitempty"`
+	TermOsc52               string   `json:"term:osc52,omitempty" jsonschema:"enum=focus,enum=always"`
 	TermDurable             *bool    `json:"term:durable,omitempty"`
 
 	EditorMinimapEnabled      bool    `json:"editor:minimapenabled,omitempty"`

schema/settings.json

@@ -151,6 +151,13 @@
         "term:bellindicator": {
           "type": "boolean"
         },
+        "term:osc52": {
+          "type": "string",
+          "enum": [
+            "focus",
+            "always"
+          ]
+        },
         "term:durable": {
           "type": "boolean"
         },