docs: add Issue & PR Label Guide to project documentation

[ghanshyam2005singh]

Fixes #489

Describe the changes you have made in this PR -

This PR adds a markdown file "issue-label.md" detailing the labeling system for issues and pull requests. The guide covers status, type, platform, OS, contributor-friendly, time-based, PR and Flutter-specific labels to improve project collaboration and clarity.

Summary by CodeRabbit

Release Notes

• Documentation
  • Added comprehensive Issue & PR Label Guide outlining status, type, platform, OS, contributor-friendly, time-based, and priority labels with detailed descriptions and usage guidance.

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[coderabbitai]

Walkthrough

This pull request introduces a new markdown documentation file that catalogs the labeling system for issues and pull requests in the repository. The file defines label categories including status (pending, in progress, blocked, duplicate, stale), type (bug, feature, enhancement, documentation, ui/ux, security, breaking change), platform (flutter, android, ios, web), operating system (windows, linux, macos), contributor-friendly designations (good first issue, help wanted), effort estimates (small, medium, large), PR-specific labels (review-ready, approved), PR priority levels (p0, p1, p2), and Flutter-specific tags (dart, state-mgmt, navigation, performance, localization, testing). The document includes usage guidance and detailed table-based descriptions for each label category.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: add Issue & PR Label Guide to project documentation' clearly and concisely summarizes the main change: adding documentation for the labeling system.
Linked Issues check	✅ Passed	The pull request successfully addresses issue #489 by adding a comprehensive markdown file documenting the repository's labeling system for issues and pull requests.
Out of Scope Changes check	✅ Passed	All changes in the pull request are directly related to the stated objective of adding label documentation; no out-of-scope modifications are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@issue_label.md`:
- Around line 112-114: The phrase in the table row for the `state-mgmt` label
uses "State management related issues"; update that description to use a
hyphenated compound adjective: change the text for the `state-mgmt` row to
"state management–related issues" (preserve the backticks around `state-mgmt`
and the table formatting).

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

Hyphenate the compound adjective.

“State management related issues” reads better as “state management–related issues.”

✏️ Suggested edit

-| `state-mgmt`   | State management related issues.               |
+| `state-mgmt`   | State management–related issues.               |

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

	| `dart` | Issues related to Dart language features. |
	| `state-mgmt` | State management related issues. |
	| `navigation` | Navigation and routing related issues. |
	| `dart` | Issues related to Dart language features. |
	| `state-mgmt` | State management–related issues. |
	| `navigation` | Navigation and routing related issues. |

🧰 Tools

🪛 LanguageTool

[grammar] ~113-~113: Use a hyphen to join words.
Context: ... | | state-mgmt | State management related issues. | | `navig...

(QB_NEW_EN_HYPHEN)

🤖 Prompt for AI Agents

In `@issue_label.md` around lines 112 - 114, The phrase in the table row for the
`state-mgmt` label uses "State management related issues"; update that
description to use a hyphenated compound adjective: change the text for the
`state-mgmt` row to "state management–related issues" (preserve the backticks
around `state-mgmt` and the table formatting).