fix(git): pass --no-ext-diff to patch-emitting git diff calls

[avshyz]

Without --no-ext-diff, patches passed to parsePatchFiles (@pierre/diffs) honor the user's diff.external config — anyone with difftastic / delta set globally got "Unsupported diff format. Showing raw patch." in the diff panel.

Adds --no-ext-diff to the three call sites whose stdout is parsed:

• CheckpointStore.diffCheckpoints
• GitCore.prepareCommitContext.stagedPatch
• GitCore.readRangeContext.diffPatch

Repro

git config --global diff.external difft

Make an edit → diff panel falls back to raw patch.

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[macroscopeapp]

Approvability

Verdict: Approved

Straightforward defensive fix adding --no-ext-diff to git diff commands to ensure consistent patch output format regardless of user's external diff driver configuration. Minimal scope with no logic changes.

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