feat: add --hint flag to provide context

[rm-hull]

Introduced a new -H/--hint flag to allow users to provide additional contextual guidance for the commit message generation. This hint is appended to the prompt sent to the LLM to improve the relevance of the generated summary.

Fixes: #105

[github-actions]

	Tests	Passed ✅	Skipped	Failed
JUnit Test Report	56 ran	56 passed	0 skipped	0 failed

Test	Result
JUnit Test Report
com/rm-hull/git-commit-summary/internal/config.TestLoad/Defaults	✅ passed
com/rm-hull/git-commit-summary/internal/config.TestLoad/WithEnvironmentVariables	✅ passed
com/rm-hull/git-commit-summary/internal/config.TestLoad	✅ passed
com/rm-hull/git-commit-summary/internal/config.Test_updateProperties/handle_empty_quoted_strings	✅ passed
com/rm-hull/git-commit-summary/internal/config.Test_updateProperties/empty_file,_add_new_properties	✅ passed
com/rm-hull/git-commit-summary/internal/config.Test_updateProperties/existing_file,_update_properties	✅ passed
com/rm-hull/git-commit-summary/internal/config.Test_updateProperties/doesnt_overwrite_values_if_new_value_is_the_same	✅ passed
com/rm-hull/git-commit-summary/internal/config.Test_updateProperties/existing_file,_add_new_and_update_existing	✅ passed
com/rm-hull/git-commit-summary/internal/config.Test_updateProperties/preserve_comments_and_other_lines	✅ passed
com/rm-hull/git-commit-summary/internal/config.Test_updateProperties/handle_mixed_quoting_styles	✅ passed
com/rm-hull/git-commit-summary/internal/config.Test_updateProperties/empty_props,_no_changes	✅ passed
com/rm-hull/git-commit-summary/internal/config.Test_updateProperties/properties_with_special_characters	✅ passed
com/rm-hull/git-commit-summary/internal/config.Test_updateProperties	✅ passed
com/rm-hull/git-commit-summary/internal/git.TestClient_prepareCommitMessage/Single_line_message_with_skipCI	✅ passed
com/rm-hull/git-commit-summary/internal/git.TestClient_prepareCommitMessage/Multi-line_message_with_skipCI	✅ passed
com/rm-hull/git-commit-summary/internal/git.TestClient_prepareCommitMessage/Single_line_message_without_skipCI	✅ passed
com/rm-hull/git-commit-summary/internal/git.TestClient_prepareCommitMessage/Multi-line_message_without_skipCI	✅ passed
com/rm-hull/git-commit-summary/internal/git.TestClient_prepareCommitMessage/Empty_message_with_skipCI	✅ passed
com/rm-hull/git-commit-summary/internal/git.TestClient_prepareCommitMessage	✅ passed
com/rm-hull/git-commit-summary/internal/llm_provider.TestNewProvider/GoogleProvider	✅ passed
com/rm-hull/git-commit-summary/internal/llm_provider.TestNewProvider/OpenAIProvider	✅ passed
com/rm-hull/git-commit-summary/internal/llm_provider.TestNewProvider/UnknownProvider	✅ passed
com/rm-hull/git-commit-summary/internal/llm_provider.TestNewProvider	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestHistory/NewHistory	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestHistory/Add_and_Value	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestHistory/Undo	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestHistory/Redo	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestHistory/Undo_at_beginning	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestHistory/Redo_at_end	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestHistory/Add_truncates_future_history	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestHistory/Multiple_Undos_and_Redos	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestHistory	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/tea.KeyMsg_-_CtrlC_in_showSpinner_state	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/tea.KeyMsg_-_CtrlC_in_other_states	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/gitCheckMsg_-_empty_(no_staged_changes)	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/gitCheckMsg_-_non-empty_(staged_changes)	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/gitDiffMsg_with_hint	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/llmResultMsg_-_with_user_message	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/llmResultMsg_-_without_user_message	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/commitMsg	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/regenerateMsg	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/userResponseMsg	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/cancelRegenPromptMsg	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/errMsg	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/abortMsg	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/spinner.Update_for_showSpinner_state	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/commitView.Update_for_showCommitView_state	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/promptView.Update_for_showRegeneratePrompt_state	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/llmResultMsg_-_YOLO_mode	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update/llmResultMsg_-_YOLO_mode_-_empty_summary	✅ passed
com/rm-hull/git-commit-summary/internal/ui.TestModel_Update	✅ passed
com/rm-hull/git-commit-summary/internal/version.TestCheckLatestReturnsLatestWhenNewer	✅ passed
com/rm-hull/git-commit-summary/internal/version.TestCheckLatestReturnsEmptyWhenUpToDate	✅ passed
com/rm-hull/git-commit-summary/internal/version.TestCheckLatestReturnsEmptyForDevel	✅ passed
com/rm-hull/git-commit-summary/internal/version.TestCheckLatestWithRevSuffix	✅ passed
com/rm-hull/git-commit-summary/internal/version.TestCheckLatestWithRevSuffixAndUpToDate	✅ passed

• View JUnit Test Report

[coveralls]

Coverage Report for CI Build 26369786331

Warning

No base build found for commit ce9cdf6 on main.
Coverage changes can't be calculated without a base build.
If a base build is processing, this comment will update automatically when it completes.

Coverage: 33.659%

Details

• Patch coverage: 5 uncovered changes across 2 files (4 of 9 lines covered, 44.44%).

Uncovered Changes

File	Changed	Covered	%
main.go	3	0	0.0%
internal/app/app.go	2	0	0.0%

Coverage Regressions

Requires a base build to compare against. How to fix this →

---

Coverage Stats

Relevant Lines:	1126
Covered Lines:	379
Line Coverage:	33.66%
Coverage Strength:	0.37 hits per line

---

💛 - Coveralls

[gemini-code-assist]

Code Review

This pull request introduces a new --hint (or -H) CLI flag to provide contextual guidance during commit summary generation. The changes include updating the application's Run method, the UI model, and the prompt generation logic to incorporate this hint. Feedback from the review suggests using simple string concatenation instead of fmt.Sprintf for basic string assembly to follow Go idioms. Additionally, several redundant comments in the test suite were identified for removal to comply with the project's style guide regarding obvious code explanations.