[PR] fix(tui): preserve legacy editor undo [maka]

["me2seeks (via GitHub)" <gi...@apache.org>]

me2seeks opened a new pull request, #3929:
URL: https://github.com/apache/maka/pull/3929

   ## Summary
   
   Preserve the editor's legacy `Ctrl+-` undo path until a side conversation exists.
   
   The TUI now reserves the ambiguous `0x1f` byte for side switching only while a side pair is active. Enhanced keyboard-protocol shortcuts and active side switching keep their existing behavior.
   
   Fixes #3928
   
   ## Verification
   
   - Regression test fails on `origin/main` and passes with this fix
   - `npm run lint`
   - `npm run format:check`
   - `npm run build`
   - `npm run typecheck`
   - `npm --workspace maka-agent run test:dist` — 514 passed
   - `npm run check:asf-headers`
   - `npx knip --workspace apps/desktop`
   - `npx knip --workspace packages/ui`
   - `git diff --check`
   
   Additional check: `npx knip --workspace packages/cli` reports five unused exported types that are already present on `origin/main`; this PR adds none of them.
   
   ## AI use
   
   Select exactly one:
   
   - [ ] No generative tool made a substantive contribution
   - [x] Generative tooling made a substantive contribution
   
   Tool(s) and scope: Codex reproduced the legacy key collision, implemented the state-scoped interception, added the regression, and performed first-principles, adversarial, and simplification reviews.
   
   ## Checklist
   
   - [x] Tests cover the change and fail without it
   - [x] Lint, format, typecheck and the affected suites pass locally
   
   Does this PR entail a change in behavior?
   
   - [x] Yes — described under Summary above
   - [ ] No
   


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Re: [PR] fix(tui): preserve legacy editor undo [maka]

["M4n5ter (via GitHub)" <gi...@apache.org>]

M4n5ter merged PR #3929:
URL: https://github.com/apache/maka/pull/3929


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