feat: allow deleting individual generation history entries

[anshk1234]

🚀 BΞYTΞFLʘW | Pull Request Protocol

PR Type: feat
Issue Link: Fixes #225

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📝 System Summary

Adds an individual delete control to each recent-generation entry, so users can remove outdated history items without clearing all saved generations.

🛠️ Technical Changes

• Logic change in src/app/generate/GeneratePageClient.tsx to remove an entry from persisted and in-memory history, and clear the active entry when applicable.
• UI update in src/components/Generator/GenerationHistory.tsx to add a hover-visible per-entry trash control.
• Database schema updated: not applicable.

🧪 Quality Assurance (QA)

• Linting: npm run lint completed successfully.
• Build: Not run.
• Testing: TypeScript validation passed; local functionality was manually tested.
• Dark Mode: Delete control follows the existing high-contrast dark UI styling.

🖼️ Visual Evidence

Add a screenshot showing the history panel and its per-entry delete control here.

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📡 Developer Authorization

• I have performed a self-review of my code.
• My changes generate no new warnings in the console.
• I have updated the documentation (if applicable).

Authorized by: @anshk1234
Timestamp: 5 September 2026, IST

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Reviewing files that changed from the base of the PR and between a705c6e and 5232029.

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• src/app/generate/GeneratePageClient.tsx
• src/lib/generationHistory.ts

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• src/app/generate/GeneratePageClient.tsx

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📝 Summary

Summary by CodeRabbit

• New Features

  • Added the ability to delete individual entries from generation history.
  • Added accessible delete controls for each history entry, with keyboard and hover/focus support.

• Bug Fixes

  • History now updates only after a deletion is successfully saved.
  • If storage is unavailable or saving fails, the remaining history entries are preserved.

Walkthrough

The generation history panel now supports deleting individual entries. Deletion persists the updated history without eviction and updates in-memory state only after persistence succeeds.

Changes

Generation history deletion

Layer / File(s)	Summary
Per-entry delete control src/components/Generator/GenerationHistory.tsx, src/app/generate/GeneratePageClient.tsx	Adds an accessible delete button to each history entry and passes the selected entry ID to the page.
History persistence and state flow src/lib/generationHistory.ts, src/app/generate/GeneratePageClient.tsx	Adds saveHistoryWithoutEviction. The page updates history state and clears the active entry only after persistence succeeds.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 52320

Users can delete individual saved generations while preserving other history entries and retaining history when local persistence fails. No current merge-blocking risk remains.

Sequence Diagram(s)

sequenceDiagram
  participant GenerationHistory
  participant GeneratePageClient
  participant generationHistory
  GenerationHistory->>GeneratePageClient: onDelete(entry.id)
  GeneratePageClient->>generationHistory: saveHistoryWithoutEviction(updatedHistory)
  generationHistory-->>GeneratePageClient: persistence success or failure
  GeneratePageClient->>GeneratePageClient: update history state and active entry ID on success

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes satisfy issue #225 by adding per-entry delete controls, removing entries from persisted and in-memory history, preserving other entries when persistence fails, and retaining the existing h…
Out of Scope Changes check	✅ Passed	All changes support issue #225 and the stated objective of reliable individual history deletion. No unrelated code changes are identified.
Title check	✅ Passed	The title clearly describes the primary change: users can delete individual generation history entries.
Description check	✅ Passed	The description directly explains the per-entry deletion feature, persistence behavior, UI changes, testing, and related issue.

✨ Finishing Touches 💡 1

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Actionable comments posted: 1

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Inline comments:
In `@src/app/generate/GeneratePageClient.tsx`:
- Around line 171-172: Update the deletion flow around saveHistory and
setHistory so failed persistence cannot trim or restore unrelated history
entries. Use a deletion-specific persistence path that preserves all surviving
entries, and only commit the deleted state when storage succeeds; otherwise
retain the existing in-memory and persisted history consistently.

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[naheel0]

Thanks @anshk1234 for completing this issue! 🎉 Great work — appreciate you taking it on and for the quick fix on the persistence edge case. Merging soon!