Turbo edits v2 (#1653)

Fixes #1222 #1646 

TODOs
- [x] description?
- [x] collect errors across all files for turbo edits
- [x] be forgiving around whitespaces
- [x] write e2e tests
- [x] do more manual testing across different models



<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adds Turbo Edits v2 search-replace flow with settings/UI selector,
parser/renderer, dry-run validation + fallback, proposal integration,
and comprehensive tests; updates licensing.
> 
> - **Engine/Processing**:
> - Add `dyad-search-replace` end-to-end: parsing
(`getDyadSearchReplaceTags`), markdown rendering (`DyadSearchReplace`),
and application (`applySearchReplace`) with dry-run validation and
fallback to `dyad-write`.
> - Inject Turbo Edits v2 system prompt; toggle via
`isTurboEditsV2Enabled`; disable classic lazy edits when v2 is on.
> - Include search-replace edits in proposals and full-response
processing.
> - **Settings/UI**:
> - Introduce `proLazyEditsMode` (`off`|`v1`|`v2`) and helper selectors;
update `ProModeSelector` with Turbo Edits and Smart Context selectors
(`data-testid`s).
> - **LLM/token flow**:
> - Construct system prompt conditionally; update token counting and
chat stream to validate and repair search-replace responses.
> - **Tests**:
> - Add unit tests for search-replace processor; e2e tests for Turbo
Edits v2 and options; fixtures and snapshots.
> - **Licensing/Docs**:
> - Add `src/pro/LICENSE` (FSL 1.1 ALv2 future), update root `LICENSE`
and README license section.
> - **Tooling**:
> - Update `.prettierignore`; enhance test helpers (selectors, path
normalization, snapshot filtering).
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
7aefa02bfae2fe22a25c7d87f3c4c326f820f1e6. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

src/components/chat/DyadMarkdownParser.tsx

@@ -8,6 +8,7 @@ import { DyadAddDependency } from "./DyadAddDependency";
 import { DyadExecuteSql } from "./DyadExecuteSql";
 import { DyadAddIntegration } from "./DyadAddIntegration";
 import { DyadEdit } from "./DyadEdit";
+import { DyadSearchReplace } from "./DyadSearchReplace";
 import { DyadCodebaseContext } from "./DyadCodebaseContext";
 import { DyadThink } from "./DyadThink";
 import { CodeHighlight } from "./CodeHighlight";
@@ -129,6 +130,7 @@ function preprocessUnclosedTags(content: string): {
     "dyad-problem-report",
     "dyad-chat-summary",
     "dyad-edit",
+    "dyad-search-replace",
     "dyad-codebase-context",
     "dyad-web-search-result",
     "dyad-web-search",
@@ -201,6 +203,7 @@ function parseCustomTags(content: string): ContentPiece[] {
     "dyad-problem-report",
     "dyad-chat-summary",
     "dyad-edit",
+    "dyad-search-replace",
     "dyad-codebase-context",
     "dyad-web-search-result",
     "dyad-web-search",
@@ -437,6 +440,21 @@ function renderCustomTag(
         </DyadEdit>
       );
 
+    case "dyad-search-replace":
+      return (
+        <DyadSearchReplace
+          node={{
+            properties: {
+              path: attributes.path || "",
+              description: attributes.description || "",
+              state: getState({ isStreaming, inProgress }),
+            },
+          }}
+        >
+          {content}
+        </DyadSearchReplace>
+      );
+
     case "dyad-codebase-context":
       return (
         <DyadCodebaseContext