#46 (SLICE-3, accept): Accept all pending proposals in one gesture

Document-edit flow SLICE-3 — completes reach→review→accept
(specs/coauthoring-document-edit-flow.md §7.2, INV-42). A single "Accept all"
gesture applies every pending proposal on the current document through the
existing F4 acceptById seam (block proposals take the INV-40 word-precise path
automatically), in descending anchor order so an earlier accept never invalidates
a later one, skipping (never force-applying) proposals that can't anchor and
reporting applied-vs-skipped. Batched application of the existing accept path — no
new mechanism; the webview posts intent only (INV-35). No confirmation dialog
(undo restores).

- proposalController.ts: acceptAllProposals(document) → {applied, skipped}
  (descending order, orphan-skip); accept/acceptById gain a silent opt so the
  batch suppresses N per-proposal orphan warnings in favour of one report.
- trackChangesPreview.ts: ToolbarMsg += {type:"acceptAll"}; handleWebviewMessage
  routes it to a public acceptAll(document) that batches + reports.
- extension.ts + package.json: cowriting.acceptAllProposals command (active doc,
  markdown-gated palette entry) for the non-webview path.
- media/preview.ts + shellHtml: "✓✓ Accept all" toolbar button, posting the
  intent, shown only with ≥2 pending proposals (authorable, on-state).
- trackChangesModel.ts: diffToBlockHunks now emits one block-aligned hunk per
  CHANGED block even when changed blocks are ADJACENT (treats changed blocks as
  1:1 anchors alongside unchanged ones; gap-spans only cover add/remove runs
  between anchors) — fixes adjacent changed blocks collapsing into one proposal.
- f12Accept host E2E (apply-all reconstructs; orphan skip + report; single
  proposal; command registered/gated); MANUAL-SMOKE-F12 §3.

214 unit + 73/5 host E2E green. Completes the document-edit-flow cluster
(#42 reach + #47 review + #46 accept).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/trackChangesPreview.ts

@@ -37,7 +37,8 @@ type ToolbarMsg =
   | { type: "reject"; proposalId: string }
   | { type: "pinBaseline" }
   | { type: "askClaude"; scope: "document" }
-  | { type: "askClaude"; scope: "selection"; start: number; end: number };
+  | { type: "askClaude"; scope: "selection"; start: number; end: number }
+  | { type: "acceptAll" };
 
 export class TrackChangesPreviewController implements vscode.Disposable {
   private readonly disposables: vscode.Disposable[] = [];
@@ -190,9 +191,29 @@ export class TrackChangesPreviewController implements vscode.Disposable {
       const target: EditTarget =
         m.scope === "selection" ? { kind: "range", start: m.start, end: m.end } : { kind: "document" };
       void this.askClaude(document, target);
+    } else if (m?.type === "acceptAll") {
+      // #46 (INV-42): batch-accept every pending proposal on this doc, then report.
+      void this.acceptAll(document);
     }
   }
 
+  /**
+   * #46 (INV-42): apply every pending proposal on the document through the F4
+   * accept seam (orphan-skip) and report the applied-vs-skipped tally. No
+   * confirmation dialog — VS Code undo restores (parity with single accept).
+   * Public so the `cowriting.acceptAllProposals` command can reach it for the
+   * active doc (not only the webview button).
+   */
+  async acceptAll(document: vscode.TextDocument): Promise<void> {
+    const { applied, skipped } = await this.proposals.acceptAllProposals(document);
+    this.refresh(document);
+    if (applied === 0 && skipped === 0) return;
+    const skipNote = skipped > 0 ? `, ${skipped} skipped (target text changed — undo or reject)` : "";
+    void vscode.window.showInformationMessage(
+      `Cowriting: accepted ${applied} proposal${applied === 1 ? "" : "s"}${skipNote}.`,
+    );
+  }
+
   /**
    * F11 (PUC-3/4): prompt host-side for the instruction (keeps the LLM/secret
    * surface out of the sealed webview, INV-8/35), run the edit turn, and surface
@@ -392,6 +413,7 @@ export class TrackChangesPreviewController implements vscode.Disposable {
     <label id="cw-toggle"><input type="checkbox" id="cw-annotations" checked /> Annotations</label>
     <button id="cw-pin" type="button" title="Pin the review baseline to now (clears the change-marks)">⌖ Pin baseline</button>
     <button id="cw-ask" type="button" title="Ask Claude to edit (the selection if any, else the whole document)">✦ Ask Claude to Edit Document</button>
+    <button id="cw-acceptall" type="button" hidden title="Accept every pending Claude proposal on this document">✓✓ Accept all</button>
     <span id="cw-epoch">Review</span>
     <span id="cw-summary"></span>
     <span id="cw-legend"></span>