fix: use existing formatSize function, size regards model files only

[KeeTraxx]

Follow up PR for #985

Fixes comments from @doringeman

Added additional tests.

[gemini-code-assist]

Code Review

This pull request consolidates size formatting logic by exporting and reusing FormatSize from the format package, and updates the search backend resolution to filter model files before calculating total size. The review feedback correctly identifies that returning "0.00B" for non-positive sizes is misleading compared to the original "n/a" representation, and points out that an error returned by FilterModelFiles is currently being silently ignored.

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[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• Changing zero/negative size formatting from "n/a" to "0.00B" alters the semantics for existing callers; consider confirming that all consumers (especially CLI output) expect this new representation or mapping it at the call site if needed.
• In backend_resolution.go the error from distributionhf.FilterModelFiles is ignored; if filtering can fail in meaningful ways, it may be safer to propagate or handle that error rather than silently falling back.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Changing zero/negative size formatting from "n/a" to "0.00B" alters the semantics for existing callers; consider confirming that all consumers (especially CLI output) expect this new representation or mapping it at the call site if needed.
- In `backend_resolution.go` the error from `distributionhf.FilterModelFiles` is ignored; if filtering can fail in meaningful ways, it may be safer to propagate or handle that error rather than silently falling back.

## Individual Comments

### Comment 1
<location path="cmd/cli/search/backend_resolution.go" line_range="95-96" />
<code_context>
 		return backendUnknown, 0, err
 	}
-	return backendFromRepoFiles(repoFiles), distributionhf.TotalSize(repoFiles), nil
+	modelFiles, _ := distributionhf.FilterModelFiles(repoFiles)
+	return backendFromRepoFiles(repoFiles), distributionhf.TotalSize(modelFiles), nil
 }

</code_context>
<issue_to_address>
**issue (bug_risk):** Swallowing the error from `FilterModelFiles` can lead to incorrect size calculation or mask resolution issues.

The error from `FilterModelFiles` is ignored, yet `TotalSize` is still computed from `modelFiles`. If filtering fails or returns a partial result, `Resolve` may return `nil` with a zero or incomplete size, making it hard to distinguish between "no model files" and "failed to determine model files" and potentially under-reporting sizes. Please propagate the error, or at least fall back to `repoFiles` for size computation when filtering fails.
</issue_to_address>

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