[Bug] Pressing . twice after an Ex command with no prior edit state causes a freeze

[coxxny]

What this PR does / why we need it:

Fixes a freeze when pressing . twice right after executing a command that is not dot-repeatable (e.g., :w, :q, :bn) at startup.

Expected

• Pressing . after a non-repeatable command is a no-op (or repeats the last edit, if any)
• No freeze or invalid state

Actual

• Pressing . twice after :w leads to an unresponsive state

Root Cause

1. After a non-dot-repeatable command at startup, lastCommandDotRepeatable=false and globalState.previousFullAction=undefined
2. Later, lastCommandDotRepeatable is reset to true
3. On the first ., CommandDot runs but adds no transformations because previousFullAction is undefined
4. Because CommandDot.createsUndoPoint = true, an empty RecordedState is saved into previousFullAction
5. On the second ., replaying this empty RecordedState via rerunRecordedState causes the invalid state/freeze

Which issue(s) this PR fixes

Fixes #9808

Special notes for your reviewer

Build & Test evidence

Build log (yarn build)

yarn run v1.22.22
$ gulp build
(node:57076) [DEP0060] DeprecationWarning: The `util._extend` API is deprecated. Please use Object.assign() instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
[10:58:34] Using gulpfile ~/document/repositories/Vim/gulpfile.js
[10:58:34] Starting 'build'...
[10:58:34] Starting 'webpack'...
[10:58:51] asset extension.js 954 KiB [emitted] [minimized] (name: main) 1 related asset
orphan modules 73.5 KiB [orphan] 15 modules
runtime modules 793 bytes 4 modules
cacheable modules 2.63 MiB
  modules by path ./src/ 1.39 MiB 162 modules
  modules by path ./node_modules/ 1.19 MiB 137 modules
  modules by path ./*.ts 27 KiB
    ./extension.ts 3.63 KiB [built] [code generated]
    ./extensionBase.ts 23.4 KiB [built] [code generated]
  ./package.json 32.7 KiB [built] [code generated]
+ 17 modules
webpack 5.102.0 compiled successfully in 15303 ms

asset extensionWeb.js 2.16 MiB [emitted] [minimized] (name: main) 1 related asset
runtime modules 344 bytes 2 modules
modules by path ./src/ 1.34 MiB 155 modules
modules by path ./node_modules/ 663 KiB
  ./node_modules/process/browser.js 5.29 KiB [built] [code generated]
  ./node_modules/parsimmon/build/parsimmon.umd.min.js 14.9 KiB [built] [code generated]
  ./node_modules/path-browserify/index.js 15.8 KiB [built] [code generated]
  ./node_modules/lodash/lodash.js 531 KiB [built] [code generated]
  ./node_modules/queue/index.js 4.03 KiB [built] [code generated]
  ./node_modules/untildify/index.js 331 bytes [built] [code generated]
  + 4 modules
modules by path ./*.ts 24 KiB
  ./extensionWeb.ts 682 bytes [built] [code generated]
  ./extensionBase.ts 23.4 KiB [built] [code generated]
external "vscode" 42 bytes [built] [code generated]
./package.json 32.7 KiB [built] [code generated]
webpack 5.102.0 compiled successfully in 8422 ms
[10:58:51] Finished 'webpack' after 16 s
[10:58:51] Starting 'commit-hash'...
[10:58:51] Finished 'commit-hash' after 11 ms
[10:58:51] Finished 'build' after 16 s
Done in 17.75s.

Test log (tail of npx gulp test)

    .
    .
    .
    ✔ b-
    ✔ b[num]
    ✔ b+[num]
    ✔ b-[num]
  3088 passing (2m)
  10 pending
[main 2025-11-01T02:02:37.500Z] Extension host with pid 222 exited with code: 0, signal: unknown.
Exit code:   0

behavior before this change

example1.txt.-.test.-.Visual.Studio.Code.2025-11-01.08-50-51.mp4

behavior after this change

example1.txt.-.test.-.Visual.Studio.Code.2025-11-01.11-55-21.mp4