losslesscut: Improve notes, fix post_install script

[NECOtype]

this PR is related to

• losslesscut: Fix file associations & general manifest updates #17889
• [Feature] LosslessCut - Add context menu shortcut #16723

and simply:
a) improves the post-install notes and makes it clearer
b) puts bin and shortcuts fields after post_install and before uninstaller (CONTRIBUTING)

• Use conventional PR title: <manifest-name[@version]|chore>: <general summary of the pull request>
• I have read the Contributing Guide

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request updates bucket/losslesscut.json by changing the install-associations note to the full reg import command, adding a $global-dependent registry host replacement in post_install, moving bin and shortcuts after post_install, and simplifying the uninstall path to directly import uninstall-associations.reg when uninstalling.

Cohort / File	Change Summary
bucket/losslesscut.json	Updated install note text, added $global registry replacement in post_install, reordered manifest fields, and simplified uninstall registry import logic

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

The uninstall script checks for the uninstall command and then runs a direct reg import for the uninstall associations file.

Related issues: None referenced in the provided context.

Related PRs: None referenced in the provided context.

Suggested labels: manifest-update

Suggested reviewers: None specified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title is concise, conventional, and matches the main changes to the losslesscut manifest.
Description check	✅ Passed	The description includes related issues, a clear summary, and the required checklist items, so it is mostly complete.

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[NECOtype]

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@bucket/losslesscut.json`:
- Around line 34-38: The uninstaller manifest has invalid JSON because the
uninstaller script is defined as an array containing a nested "script" key/value
pair, which breaks parsing. Fix the "uninstaller" entry in losslesscut.json by
collapsing the malformed "script" structure into one valid property using either
a single string or a proper one-item array, and remove the duplicated inner
"script" key so the uninstall command is represented correctly.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between c2bea8b and 58a79fa.

📒 Files selected for processing (1)

• bucket/losslesscut.json

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