## Description
Fixes#49285
This PR fixes three documentation files with broken links or incorrect
source file references:
### 1. `doc/devdocs/modules/fileexploreraddons.md` — broken source code
link
The "Source code folder" link pointed to
`src/modules/fileexplorerpreview`, which does not exist in the
repository. Changed to `src/modules/previewpane` (the actual directory).
### 2. `doc/devdocs/modules/launcher/plugins/calculator.md` — broken
unit test links (10 occurrences)
All 10 links in the "Unit Tests" section pointed to
`Microsoft.PowerToys.Run.Plugin.Calculator.UnitTests` (plural), but the
actual test project directory is
`Microsoft.PowerToys.Run.Plugin.Calculator.UnitTest` (singular). All
link references have been corrected.
### 3. `doc/devdocs/core/runner.md` — incorrect file reference
The "Centralized Keyboard Hook" section referenced
`centralized_keyboard_hook.cpp`, but the actual file is
`centralized_kb_hook.cpp` (at `src/runner/centralized_kb_hook.cpp`).
## Validation
Each fix was verified against the actual repository structure:
| Fix | Verified path exists |
|-----|---------------------|
| `fileexploreraddons.md` | `src/modules/previewpane/` (contains
`powerpreview/` subproject) |
| `calculator.md` |
`src/modules/launcher/Plugins/Microsoft.PowerToys.Run.Plugin.Calculator.UnitTest/`
(contains `BracketHelperTests.cs`, `ExtendedCalculatorParserTests.cs`,
`NumberTranslatorTests.cs`, `QueryTests.cs`) |
| `runner.md` | `src/runner/centralized_kb_hook.cpp` |
## PR Checklist
- [x] Docs-only change — no code or tests affected
- [x] Links verified against actual repository structure