Clarify progress total represents all entries, not just changed files

[Copilot]

Users misunderstood the progress counter to show only changed files. The resultBuilder callback in dir-compare fires for every entry pair (equal, distinct, left-only, right-only), so total count represents all comparison work.

Changes

Updated progress messages for clarity:

// Before
progress.report({ message: 'Counting entries...' });
progress.report({ message: `Found ${totalEntries} entries, comparing...` });

// After  
progress.report({ message: 'Counting all entries...' });
progress.report({ message: `Found ${totalEntries} entries (all files/folders), comparing...` });

Example

Comparing two folders with 100 files each (95 identical, 5 different):

• Before: User sees "200 entries" and wonders why so many when only 5 changed
• After: User sees "200 entries (all files/folders)" and understands all files are examined

This accurately represents the work: the comparison examines every file regardless of whether it differs.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add status/progress indication</issue_title>
<issue_description>I am often diffing very large project folders. The diff can take a long term to generate. My biggest frustration with the process is that the extension offers no indication of its status/progress. I'll often start a diff, it'll seem that nothing is happening, and then the diff will pop up a few minutes later. This leads to confusion, needless retries, etc. Please add some sofrt of status indication somewhere in the UI.</issue_description>

<agent_instructions>Use the extension's existing loader ui infrastructure </agent_instructions>

Comments on the Issue (you are @copilot in this section)

@moshfeu Hi @nabelekt, thanks for the suggestion I'm looking into it to see if it's possible since the extension fully relays on the great library _dir-compare_'s for the comparison @moshfeu Huge delay, sorry 😅 When I re-read it now, I'm not sure why I said that it might not be possible. If I understand correctly you asked to add a loader when the comparison starts. If so (as asked in #243), I'm on it now @moshfeu I remember now why I said that it might not possible and I was referring to the "progress" request - to present the progress of the comparison process but showing a loaded it is possible

• Fixes Add status/progress indication #241

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