#2226: show IDEasy project, workspace and repository in the git-bash window title

[maybeec]

This PR fixes #2226

Git Bash bakes a window title escape sequence into PS1 (see /etc/profile.d/git-prompt.sh), so the title is rewritten to MINGW64:«current-directory» on every prompt and cannot be set permanently. All git-bash tabs and windows therefore look alike in the taskbar and in Alt+Tab.

This PR removes that sequence and writes an IDEasy specific title instead, so you can see at a glance which project and workspace a shell is initialized for.

Implemented changes:

• Added _ide_title to cli/src/main/package/functions, which writes the terminal title and degrades gracefully depending on the available context:

  Situation	Title
  Inside a repository	ideasy>devonfw>main>IDEasy
  Inside a workspace, outside any repository	ideasy>devonfw>main
  Inside a project, outside any workspace	ideasy>devonfw
  Outside any IDEasy project	ideasy

• The repository is the counterpart of icd -r, i.e. the first folder below the workspace. Consistent with the implicit -r resolution, hidden folders (e.g. .vscode) are not treated as repositories, and for a nested repository such as backend/core only the top-level folder is shown to keep the title short.

• Workspace and repository are derived from PWD and not from the WORKSPACE variable, because ideasy env --bash always emits WORKSPACE="main" as a default - even when the current directory is completely outside IDE_ROOT. As a side effect the title also follows a plain cd, not only ide/icd.

• Extracted _ide_path_segment as the single place that determines a path segment below a base directory. It is used for the workspace and the repository of the title as well as for the project inference in _icd_project_dir, which previously duplicated this logic. Its result is passed via a variable rather than echoed, so that no subshell is forked - _ide_title runs on every prompt and process creation is expensive on Windows.

• The git-bash title sequence is removed from PS1 and _ide_title is hooked into PROMPT_COMMAND. Both steps are idempotent, so sourcing the functions file again (e.g. via source ~/.bashrc) does not duplicate the hook or strip PS1 twice.

• The whole block is guarded by the existing _ide_is_msys helper plus a BASH_VERSION check, so macOS, Linux and Cygwin are not touched at all - their prompt is configured by the user or the distribution. The BASH_VERSION check is needed because the functions file is also sourced from zsh, which has no PROMPT_COMMAND (it uses precmd).

• An existing PROMPT_COMMAND is preserved, including the array form supported since bash 5.1. The IDEasy hook is prepended so a user's own hook runs afterwards and can still override the title.

• The PS1 rewrite only triggers when the title sequence is at the very beginning of the prompt, so a custom prompt (e.g. via the ~/.config/git/git-prompt.sh hook honored by git-bash) is left untouched.

• Added 18 tests to cli/src/test/functions-test.sh and documented the behavior in documentation/advanced-tooling-windows.adoc.

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Testing instructions

Automated:

1. Run bash cli/src/test/functions-test.sh - this is the same entry point CI uses (.github/workflows/build-pr.yml). All tests must pass.
   Note that the zsh cases are skipped when zsh is not on the PATH (e.g. on Windows). They were verified on ubuntu:24.04 with zsh 5.9, where the suite reports 43 of 43 passed, including zsh -n parsing of the functions file.
2. Run bash cli/src/test/icd-completion-test.sh - _icd_project_dir was refactored, so the icd completion tests must still pass.

Manual (Windows, git-bash):

1. Open a git-bash terminal in an IDEasy project and run source ~/.bashrc.
2. icd -r into a repository - the window/tab title shows ideasy>«your-project»>«workspace»>«repository».
3. cd .. up into the workspace - the title shows ideasy>«your-project»>«workspace».
4. cd into a hidden folder of the workspace (e.g. .vscode) - the title still shows ideasy>«your-project»>«workspace».
5. icd into the project root (outside workspaces) - the title shows ideasy>«your-project».
6. cd ~ and run ide - the title shows ideasy.
7. Verify the visible prompt itself is unchanged: colors, $MSYSTEM, the working directory and the git branch from __git_ps1 are all still there.
8. Verify icd -p«Tab», icd -w«Tab» and icd -r«Tab» still complete as before.

Manual (macOS/Linux, regression):

1. Open a terminal in an IDEasy project and run source ~/.bashrc (or ~/.zshrc).
2. Verify your prompt and window title behave exactly as before - IDEasy must not change either.

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Checklist for this PR

Make sure everything is checked before merging this PR. For further info please also see
our DoD.

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
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• Issue is set to In Progress and assigned to you or there is no issue (might happen for very small PRs)
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• You have added the issue implemented by your PR in CHANGELOG.adoc unless issue is labeled
  with internal
• You have formulated clear instructions on how to test your contribution under "Testing instructions"

[coveralls]

Coverage Report for CI Build 30397974379

Coverage increased (+0.02%) to 72.614%

Details

• Coverage increased (+0.02%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 1 coverage regression across 1 file.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

1 previously-covered line in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
com/devonfw/tools/ide/tool/ide/IdeToolCommandlet.java	1	78.33%

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Coverage Stats

Relevant Lines:	16997
Covered Lines:	12866
Line Coverage:	75.7%
Relevant Branches:	7603
Covered Branches:	4997
Branch Coverage:	65.72%
Branches in Coverage %:	Yes
Coverage Strength:	3.21 hits per line

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💛 - Coveralls